The reaction Zn + 2H⁺ → Zn²⁺ + H₂ is an example of:
A. oxidation
B. reduction
C. redox
D. neutralization
Correct Answer: C
---
27.
Hydrogen is a very good reducing agent because it:
A. has low density
B. readily accepts electrons
C. readily donates electrons
D. is diatomic
Correct Answer: C
---
28.
The laboratory test to distinguish hydrogen from carbon monoxide is:
A. burning with pop
B. passing through lime water
C. burning with pale blue flame only
D. reducing CuO to Cu
Correct Answer: C
---
29.
Hydrogen is used in oxy-hydrogen flame for:
A. welding
B. filling balloons
C. Haber process
D. hydrogenation of coal
Correct Answer: A
---
30.
The hydride NaH is:
A. saline hydride
B. covalent hydride
C. metallic hydride
D. complex hydride
Correct Answer: A
---
98.
When sodium is wrapped in wire gauze and dropped in water, it is done to:
A. prevent explosion
B. collect more gas
C. make it sink
D. increase reaction rate
Correct Answer: A
---
99.
The metal that reacts most vigorously with cold water is:
A. Ca
B. Na
C. K
D. Mg
Correct Answer: C (K > Na > Ca > Mg)
---
100.
Hydrogen is not collected by downward displacement of air because it is:
A. lighter than air
B. heavier than air
C. soluble in water
D. explosive
Correct Answer: A
A. oxidation
B. reduction
C. redox
D. neutralization
Correct Answer: C
---
27.
Hydrogen is a very good reducing agent because it:
A. has low density
B. readily accepts electrons
C. readily donates electrons
D. is diatomic
Correct Answer: C
---
28.
The laboratory test to distinguish hydrogen from carbon monoxide is:
A. burning with pop
B. passing through lime water
C. burning with pale blue flame only
D. reducing CuO to Cu
Correct Answer: C
---
29.
Hydrogen is used in oxy-hydrogen flame for:
A. welding
B. filling balloons
C. Haber process
D. hydrogenation of coal
Correct Answer: A
---
30.
The hydride NaH is:
A. saline hydride
B. covalent hydride
C. metallic hydride
D. complex hydride
Correct Answer: A
---
98.
When sodium is wrapped in wire gauze and dropped in water, it is done to:
A. prevent explosion
B. collect more gas
C. make it sink
D. increase reaction rate
Correct Answer: A
---
99.
The metal that reacts most vigorously with cold water is:
A. Ca
B. Na
C. K
D. Mg
Correct Answer: C (K > Na > Ca > Mg)
---
100.
Hydrogen is not collected by downward displacement of air because it is:
A. lighter than air
B. heavier than air
C. soluble in water
D. explosive
Correct Answer: A
*CONTINUETION*
101.
The reaction of sodium with cold water is so violent that the apparatus must:
A. be heated
B. use only a small piece of sodium
C. use hot water
D. use dilute acid
Correct Answer: B
---
102.
When sodium reacts with cold water, the gas evolved:
A. burns with a yellow flame
B. relights a glowing splint
C. gives a pop sound with a lighted splint
D. turns lime water milky
Correct Answer: C
---
103.
The function of the trough full of water in the sodium + cold water method is to:
A. cool the sodium
B. collect hydrogen by downward delivery
C. allow the sodium to sink and react safely
D. dissolve the sodium hydroxide formed
Correct Answer: C
---
104.
In the steam + red-hot iron experiment, a constant flow of steam is maintained to:
A. prevent reverse reaction
B. increase temperature
C. dissolve iron
D. produce more heat
Correct Answer: A
---
105.
The forward reaction between iron and steam is favoured by:
A. low temperature
B. removing hydrogen
C. adding more iron
D. using cold iron
Correct Answer: B
---
106.
Hydrogen reduces heated copper(II) oxide to shiny:
A. red copper
B. black copper
C. brown copper
D. grey copper
Correct Answer: A
---
107.
Which of the following does NOT liberate hydrogen from dilute acids?
A. Magnesium
B. Zinc
C. Iron
D. Silver
Correct Answer: D
---
108.
Metals below hydrogen in the reactivity series:
A. liberate hydrogen from water
B. liberate hydrogen from steam
C. do not liberate hydrogen from dilute acids
D. are strong reducing agents
Correct Answer: C
---
109.
The hydrides formed by elements of Group 1 and 2 are generally:
A. covalent
B. ionic/saline
C. metallic
D. complex
Correct Answer: B
---
110.
Which hydride is used as a moderator in nuclear reactors?
A. NH₃
B. H₂O
C. D₂O
D. CH₄
Correct Answer: C
---
111.
The isotope of hydrogen used in making heavy water is:
A. protium
B. deuterium
C. tritium
D. hydrogen-4
Correct Answer: B
---
112.
The mass numbers of the three isotopes of hydrogen are:
A. 1, 2, 3
B. 1, 1, 2
C. 2, 3, 4
D. 1, 2, 4
Correct Answer: A
---
113.
The most abundant isotope of hydrogen is:
A. protium
B. deuterium
C. tritium
D. all are equal
Correct Answer: A
---
114.
Hydrogen behaves as an oxidising agent when it reacts with:
A. Na
B. CuO
C. Fe₃O₄
D. PbO
Correct Answer: A
---
115.
The industrial preparation of hydrogen by Bosch process involves:
A. water gas + steam
B. electrolysis of brine
C. cracking of petroleum
D. fermentation
Correct Answer: A
---
116.
Water gas is a mixture of:
A. CO + H₂
B. CO₂ + H₂
C. CH₄ + H₂
D. CO + N₂
Correct Answer: A
---
117.
In the Bosch process, the catalyst used is:
A. iron(III) oxide
B. vanadium(V) oxide
C. platinum
D. nickel
Correct Answer: A
---
118.
The final step in Bosch process removes:
A. CO
B. CO₂
C. H₂S
D. N₂
Correct Answer: B
---
119.
Hydrogen is used for hardening oils because it:
A. adds to unsaturated bonds
B. removes oxygen
C. reduces fats
D. oxidises fats
Correct Answer: A
---
120.
Oxy-hydrogen flame reaches a temperature of about:
A. 1000 °C
B. 1800 °C
C. 2800 °C
D. 3500 °C
Correct Answer: C
---
121.
Hydrogen is used as a rocket fuel because it:
A. has high calorific value
B. is very light
C. burns quietly
D. both A and B
Correct Answer: D
---
122.
The gas that burns with a pop sound is:
A. oxygen
B. hydrogen
C. nitrogen
D. carbon dioxide
Correct Answer: B
---
123.
A lighted splint is extinguished with a pop sound in pure hydrogen because:
A. hydrogen supports combustion
B. hydrogen burns explosively in limited oxygen
C. hydrogen is denser
D. hydrogen is wet
Correct Answer: B
---
124.
Hydrogen is dried using:
A. concentrated H₂SO₄
B. CaCl₂
C. P₂O₅
D. all of the above
Correct Answer: D
---
125.
The reagent that removes carbon(IV) oxide from hydrogen in industrial preparation is:
A. water
B. NaOH solution
C. CuSO₄ solution
D. CaO
Correct Answer: B
---
126.
In the reactivity series shown in your book, hydrogen is placed just above:
A. copper
B. iron
C. lead
D. silver
Correct Answer: A
---
101.
The reaction of sodium with cold water is so violent that the apparatus must:
A. be heated
B. use only a small piece of sodium
C. use hot water
D. use dilute acid
Correct Answer: B
---
102.
When sodium reacts with cold water, the gas evolved:
A. burns with a yellow flame
B. relights a glowing splint
C. gives a pop sound with a lighted splint
D. turns lime water milky
Correct Answer: C
---
103.
The function of the trough full of water in the sodium + cold water method is to:
A. cool the sodium
B. collect hydrogen by downward delivery
C. allow the sodium to sink and react safely
D. dissolve the sodium hydroxide formed
Correct Answer: C
---
104.
In the steam + red-hot iron experiment, a constant flow of steam is maintained to:
A. prevent reverse reaction
B. increase temperature
C. dissolve iron
D. produce more heat
Correct Answer: A
---
105.
The forward reaction between iron and steam is favoured by:
A. low temperature
B. removing hydrogen
C. adding more iron
D. using cold iron
Correct Answer: B
---
106.
Hydrogen reduces heated copper(II) oxide to shiny:
A. red copper
B. black copper
C. brown copper
D. grey copper
Correct Answer: A
---
107.
Which of the following does NOT liberate hydrogen from dilute acids?
A. Magnesium
B. Zinc
C. Iron
D. Silver
Correct Answer: D
---
108.
Metals below hydrogen in the reactivity series:
A. liberate hydrogen from water
B. liberate hydrogen from steam
C. do not liberate hydrogen from dilute acids
D. are strong reducing agents
Correct Answer: C
---
109.
The hydrides formed by elements of Group 1 and 2 are generally:
A. covalent
B. ionic/saline
C. metallic
D. complex
Correct Answer: B
---
110.
Which hydride is used as a moderator in nuclear reactors?
A. NH₃
B. H₂O
C. D₂O
D. CH₄
Correct Answer: C
---
111.
The isotope of hydrogen used in making heavy water is:
A. protium
B. deuterium
C. tritium
D. hydrogen-4
Correct Answer: B
---
112.
The mass numbers of the three isotopes of hydrogen are:
A. 1, 2, 3
B. 1, 1, 2
C. 2, 3, 4
D. 1, 2, 4
Correct Answer: A
---
113.
The most abundant isotope of hydrogen is:
A. protium
B. deuterium
C. tritium
D. all are equal
Correct Answer: A
---
114.
Hydrogen behaves as an oxidising agent when it reacts with:
A. Na
B. CuO
C. Fe₃O₄
D. PbO
Correct Answer: A
---
115.
The industrial preparation of hydrogen by Bosch process involves:
A. water gas + steam
B. electrolysis of brine
C. cracking of petroleum
D. fermentation
Correct Answer: A
---
116.
Water gas is a mixture of:
A. CO + H₂
B. CO₂ + H₂
C. CH₄ + H₂
D. CO + N₂
Correct Answer: A
---
117.
In the Bosch process, the catalyst used is:
A. iron(III) oxide
B. vanadium(V) oxide
C. platinum
D. nickel
Correct Answer: A
---
118.
The final step in Bosch process removes:
A. CO
B. CO₂
C. H₂S
D. N₂
Correct Answer: B
---
119.
Hydrogen is used for hardening oils because it:
A. adds to unsaturated bonds
B. removes oxygen
C. reduces fats
D. oxidises fats
Correct Answer: A
---
120.
Oxy-hydrogen flame reaches a temperature of about:
A. 1000 °C
B. 1800 °C
C. 2800 °C
D. 3500 °C
Correct Answer: C
---
121.
Hydrogen is used as a rocket fuel because it:
A. has high calorific value
B. is very light
C. burns quietly
D. both A and B
Correct Answer: D
---
122.
The gas that burns with a pop sound is:
A. oxygen
B. hydrogen
C. nitrogen
D. carbon dioxide
Correct Answer: B
---
123.
A lighted splint is extinguished with a pop sound in pure hydrogen because:
A. hydrogen supports combustion
B. hydrogen burns explosively in limited oxygen
C. hydrogen is denser
D. hydrogen is wet
Correct Answer: B
---
124.
Hydrogen is dried using:
A. concentrated H₂SO₄
B. CaCl₂
C. P₂O₅
D. all of the above
Correct Answer: D
---
125.
The reagent that removes carbon(IV) oxide from hydrogen in industrial preparation is:
A. water
B. NaOH solution
C. CuSO₄ solution
D. CaO
Correct Answer: B
---
126.
In the reactivity series shown in your book, hydrogen is placed just above:
A. copper
B. iron
C. lead
D. silver
Correct Answer: A
---
127.
Aluminium reacts with hot concentrated NaOH to liberate hydrogen because aluminium forms:
A. aluminate ion
B. oxide layer
C. chloride
D. sulphate
Correct Answer: A
---
128.
The equation Al + NaOH + H₂O → ? + H₂ shows the product:
A. NaAlO₂
B. Na₃AlO₃
C. Na[Al(OH)₄]
D. Al(OH)₃
Correct Answer: C
---
129.
The metal that reacts with both cold water and dilute acids vigorously is:
A. calcium
B. magnesium
C. zinc
D. iron
Correct Answer: A
---
130.
The black residue in steam + iron experiment is:
A. triiron tetraoxide
B. iron(II) oxide
C. iron(III) oxide
D. iron(II,III) oxide
Correct Answer: A (or D — both refer to Fe₃O₄)
---
131.
Hydrogen can reduce all the following except:
A. CuO
B. Fe₂O₃
C. Na₂O
D. ZnO
Correct Answer: C
---
132.
The hydride NH₃ is:
A. ionic
B. covalent
C. metallic
D. saline
Correct Answer: B
---
133.
The hydride CH₄ belongs to:
A. saline hydrides
B. covalent hydrides
C. interstitial hydrides
D. complex hydrides
Correct Answer: B
---
134.
Hydrogen is a very powerful reducing agent in metallurgy because it:
A. removes oxygen from metal oxides
B. adds oxygen
C. forms alloys
D. cools the metal
Correct Answer: A
---
135.
The test tube is inverted over the iron filings in steam experiment to:
A. collect hydrogen
B. prevent air entering
C. heat the iron
D. cool the steam
Correct Answer: B
---
136.
The colour of litmus when sodium reacts with water containing phenolphthalein becomes:
A. pink
B. blue
C. colourless
D. red
Correct Answer: A
---
137.
Hydrogen is not collected by downward displacement of air because it is:
A. lighter than air
B. heavier than air
C. soluble in water
D. explosive
Correct Answer: A
---
138.
The common name for D₂O is:
A. light water
B. heavy water
C. hard water
D. soft water
Correct Answer: B
---
139.
Tritium has mass number:
A. 1
B. 2
C. 3
D. 4
Correct Answer: C
---
140.
Hydrogen is used in the manufacture of:
A. ammonia
B. margarine
C. methanol
D. all of the above
Correct Answer: D
Aluminium reacts with hot concentrated NaOH to liberate hydrogen because aluminium forms:
A. aluminate ion
B. oxide layer
C. chloride
D. sulphate
Correct Answer: A
---
128.
The equation Al + NaOH + H₂O → ? + H₂ shows the product:
A. NaAlO₂
B. Na₃AlO₃
C. Na[Al(OH)₄]
D. Al(OH)₃
Correct Answer: C
---
129.
The metal that reacts with both cold water and dilute acids vigorously is:
A. calcium
B. magnesium
C. zinc
D. iron
Correct Answer: A
---
130.
The black residue in steam + iron experiment is:
A. triiron tetraoxide
B. iron(II) oxide
C. iron(III) oxide
D. iron(II,III) oxide
Correct Answer: A (or D — both refer to Fe₃O₄)
---
131.
Hydrogen can reduce all the following except:
A. CuO
B. Fe₂O₃
C. Na₂O
D. ZnO
Correct Answer: C
---
132.
The hydride NH₃ is:
A. ionic
B. covalent
C. metallic
D. saline
Correct Answer: B
---
133.
The hydride CH₄ belongs to:
A. saline hydrides
B. covalent hydrides
C. interstitial hydrides
D. complex hydrides
Correct Answer: B
---
134.
Hydrogen is a very powerful reducing agent in metallurgy because it:
A. removes oxygen from metal oxides
B. adds oxygen
C. forms alloys
D. cools the metal
Correct Answer: A
---
135.
The test tube is inverted over the iron filings in steam experiment to:
A. collect hydrogen
B. prevent air entering
C. heat the iron
D. cool the steam
Correct Answer: B
---
136.
The colour of litmus when sodium reacts with water containing phenolphthalein becomes:
A. pink
B. blue
C. colourless
D. red
Correct Answer: A
---
137.
Hydrogen is not collected by downward displacement of air because it is:
A. lighter than air
B. heavier than air
C. soluble in water
D. explosive
Correct Answer: A
---
138.
The common name for D₂O is:
A. light water
B. heavy water
C. hard water
D. soft water
Correct Answer: B
---
139.
Tritium has mass number:
A. 1
B. 2
C. 3
D. 4
Correct Answer: C
---
140.
Hydrogen is used in the manufacture of:
A. ammonia
B. margarine
C. methanol
D. all of the above
Correct Answer: D
*CONTINUETION LAST*
141.
The pale blue flame of burning hydrogen becomes almost invisible in daylight because it:
A. produces no soot
B. has very low luminosity
C. produces water only
D. is very hot
Correct Answer: B
---
142.
Hydrogen is used to fill weather balloons because it:
A. is the lightest gas
B. is cheap
C. does not react with rubber
D. burns slowly
Correct Answer: A
---
143.
In the laboratory, hydrogen is purified by passing it through:
A. acidified KMnO₄
B. silver nitrate solution
C. anhydrous calcium chloride
D. sodium hydroxide pellets
Correct Answer: B
---
144.
The reaction 2H₂(g) + O₂(g) → 2H₂O(l) is highly:
A. endothermic
B. exothermic
C. reversible
D. slow
Correct Answer: B
---
145.
Which of the following hydrides is electron-deficient?
A. CH₄
B. NH₃
C. H₂O
D. B₂H₆
Correct Answer: D
---
146.
Hydrogen acts as a reducing agent in the reaction:
A. 2Na + H₂ → 2NaH
B. CuO + H₂ → Cu + H₂O
C. Cl₂ + H₂ → 2HCl
D. N₂ + 3H₂ → 2NH₃
Correct Answer: B
---
147.
The only hydride that is a liquid at room temperature among the following is:
A. HF
B. HCl
C. HBr
D. H₂O
Correct Answer: D
---
148.
The metal that will displace hydrogen from steam but not from cold water is:
A. calcium
B. zinc
C. potassium
D. sodium
Correct Answer: B
---
149.
In the reactivity series diagram in your book, hydrogen is placed directly between:
A. lead and copper
B. zinc and iron
C. iron and lead
D. copper and silver
Correct Answer: A
---
150.
The equation for the action of cold water on sodium is:
A. 2Na + 2H₂O → 2NaOH + H₂
B. Na + H₂O → NaOH + ½H₂
C. 2Na + H₂O → Na₂O + H₂
D. Na + 2H₂O → Na(OH)₂ + H₂
Correct Answer: A
---
151.
When steam is passed over red-hot coke, the gas produced is:
A. producer gas
B. water gas
C. coal gas
D. synthesis gas
Correct Answer: B
---
152.
The catalyst used in the conversion of water gas to hydrogen in Bosch process is:
A. Fe₂O₃
B. V₂O₅
C. Ni
D. Pt
Correct Answer: A
---
153.
Hydrogen is preferred as a fuel in rockets because it has:
A. highest calorific value per gram
B. lowest density
C. both A and B
D. no residue
Correct Answer: C
---
154.
The hydride formed when hydrogen reacts with calcium is:
A. CaH₂
B. CaH
C. Ca₂H
D. Ca(OH)₂
Correct Answer: A
---
155.
Which of the following is NOT a use of hydrogen?
A. Filling balloons
B. Cutting and welding metals
C. Manufacture of HCl
D. Bleaching agent
Correct Answer: D
---
156.
Hydrogen differs from alkali metals because it is:
A. diatomic
B. non-metal
C. has one electron in outer shell but forms H⁻ rarely in compounds
D. all of the above
Correct Answer: D
---
157.
The volume of hydrogen (at s.t.p.) produced when 1.3 g of zinc reacts completely with excess dilute acid is (Zn = 65):
A. 224 cm³
B. 448 cm³
C. 11.2 dm³
D. 22.4 dm³
Correct Answer: B
(0.02 mol Zn → 0.02 mol H₂ → 448 cm³)
---
158.
In the pop-sound test, the pop is loudest when hydrogen is:
A. pure
B. mixed with little air
C. mixed with excess air
D. wet
Correct Answer: B
---
159.
The drying agent that cannot be used for drying hydrogen is:
A. CaCl₂
B. P₂O₅
C. Conc. H₂SO₄
D. NaOH pellets
Correct Answer: D
---
160.
The metal that forms an amphoteric oxide and reacts with NaOH to liberate hydrogen is:
A. Zn
B. Fe
C. Mg
D. Al
Correct Answer: D
(Most accepted answer: D — Al)
---
161.
The reaction 3Fe(s) + 4H₂O(g) ⇌ Fe₃O₄(s) + 4H₂(g) is driven backwards by:
A. passing hydrogen over hot Fe₃O₄
B. increasing temperature
C. using cold iron
D. reducing steam supply
Correct Answer: A
---
162.
The colourless gas that rekindles a glowing splint is:
A. hydrogen
B. oxygen
C. nitrogen
D. carbon dioxide
Correct Answer: B
---
163.
Hydrogen is used in the manufacture of margarine by:
A. hydrogenation of oils
B. oxidation of oils
C. dehydration
D. hydration
Correct Answer: A
---
164.
The isotope tritium is:
A. stable
B. radioactive
C. non-existent
D. most abundant
Correct Answer: B
---
165.
141.
The pale blue flame of burning hydrogen becomes almost invisible in daylight because it:
A. produces no soot
B. has very low luminosity
C. produces water only
D. is very hot
Correct Answer: B
---
142.
Hydrogen is used to fill weather balloons because it:
A. is the lightest gas
B. is cheap
C. does not react with rubber
D. burns slowly
Correct Answer: A
---
143.
In the laboratory, hydrogen is purified by passing it through:
A. acidified KMnO₄
B. silver nitrate solution
C. anhydrous calcium chloride
D. sodium hydroxide pellets
Correct Answer: B
---
144.
The reaction 2H₂(g) + O₂(g) → 2H₂O(l) is highly:
A. endothermic
B. exothermic
C. reversible
D. slow
Correct Answer: B
---
145.
Which of the following hydrides is electron-deficient?
A. CH₄
B. NH₃
C. H₂O
D. B₂H₆
Correct Answer: D
---
146.
Hydrogen acts as a reducing agent in the reaction:
A. 2Na + H₂ → 2NaH
B. CuO + H₂ → Cu + H₂O
C. Cl₂ + H₂ → 2HCl
D. N₂ + 3H₂ → 2NH₃
Correct Answer: B
---
147.
The only hydride that is a liquid at room temperature among the following is:
A. HF
B. HCl
C. HBr
D. H₂O
Correct Answer: D
---
148.
The metal that will displace hydrogen from steam but not from cold water is:
A. calcium
B. zinc
C. potassium
D. sodium
Correct Answer: B
---
149.
In the reactivity series diagram in your book, hydrogen is placed directly between:
A. lead and copper
B. zinc and iron
C. iron and lead
D. copper and silver
Correct Answer: A
---
150.
The equation for the action of cold water on sodium is:
A. 2Na + 2H₂O → 2NaOH + H₂
B. Na + H₂O → NaOH + ½H₂
C. 2Na + H₂O → Na₂O + H₂
D. Na + 2H₂O → Na(OH)₂ + H₂
Correct Answer: A
---
151.
When steam is passed over red-hot coke, the gas produced is:
A. producer gas
B. water gas
C. coal gas
D. synthesis gas
Correct Answer: B
---
152.
The catalyst used in the conversion of water gas to hydrogen in Bosch process is:
A. Fe₂O₃
B. V₂O₅
C. Ni
D. Pt
Correct Answer: A
---
153.
Hydrogen is preferred as a fuel in rockets because it has:
A. highest calorific value per gram
B. lowest density
C. both A and B
D. no residue
Correct Answer: C
---
154.
The hydride formed when hydrogen reacts with calcium is:
A. CaH₂
B. CaH
C. Ca₂H
D. Ca(OH)₂
Correct Answer: A
---
155.
Which of the following is NOT a use of hydrogen?
A. Filling balloons
B. Cutting and welding metals
C. Manufacture of HCl
D. Bleaching agent
Correct Answer: D
---
156.
Hydrogen differs from alkali metals because it is:
A. diatomic
B. non-metal
C. has one electron in outer shell but forms H⁻ rarely in compounds
D. all of the above
Correct Answer: D
---
157.
The volume of hydrogen (at s.t.p.) produced when 1.3 g of zinc reacts completely with excess dilute acid is (Zn = 65):
A. 224 cm³
B. 448 cm³
C. 11.2 dm³
D. 22.4 dm³
Correct Answer: B
(0.02 mol Zn → 0.02 mol H₂ → 448 cm³)
---
158.
In the pop-sound test, the pop is loudest when hydrogen is:
A. pure
B. mixed with little air
C. mixed with excess air
D. wet
Correct Answer: B
---
159.
The drying agent that cannot be used for drying hydrogen is:
A. CaCl₂
B. P₂O₅
C. Conc. H₂SO₄
D. NaOH pellets
Correct Answer: D
---
160.
The metal that forms an amphoteric oxide and reacts with NaOH to liberate hydrogen is:
A. Zn
B. Fe
C. Mg
D. Al
Correct Answer: D
(Most accepted answer: D — Al)
---
161.
The reaction 3Fe(s) + 4H₂O(g) ⇌ Fe₃O₄(s) + 4H₂(g) is driven backwards by:
A. passing hydrogen over hot Fe₃O₄
B. increasing temperature
C. using cold iron
D. reducing steam supply
Correct Answer: A
---
162.
The colourless gas that rekindles a glowing splint is:
A. hydrogen
B. oxygen
C. nitrogen
D. carbon dioxide
Correct Answer: B
---
163.
Hydrogen is used in the manufacture of margarine by:
A. hydrogenation of oils
B. oxidation of oils
C. dehydration
D. hydration
Correct Answer: A
---
164.
The isotope tritium is:
A. stable
B. radioactive
C. non-existent
D. most abundant
Correct Answer: B
---
165.
Hydrogen resembles halogens because it:
A. forms H⁻ ion
B. is diatomic
C. needs one electron to complete octet
D. all of the above
Correct Answer: D
---
166.
The gas jar is inverted over the delivery tube in zinc + acid method to:
A. collect hydrogen by downward displacement of water
B. prevent escape of gas
C. cool the gas
D. dry the gas
Correct Answer: A
---
167.
When zinc reacts with dilute H₂SO₄, the zinc sulphate formed is:
A. ZnSO₄
B. Zn₂SO₄
C. Zn(SO₄)₂
D. ZnSO₃
Correct Answer: A
---
168.
The common impurity removed by passing hydrogen through acidified copper(II) sulphate solution is:
A. H₂S
B. AsH₃
C. PH₃
D. all of the above
Correct Answer: D
---
169.
Hydrogen is a better reducing agent than carbon monoxide at high temperature because:
A. it is lighter
B. reaction is more exothermic
C. it is cheaper
D. it is pure
Correct Answer: B
---
170.
The hydride used in airships in the past was:
A. hydrogen
B. helium
C. ammonia
D. methane
Correct Answer: A
---
171.
The test for purity of hydrogen is that it burns with:
A. pop sound
B. pale blue flame and no pop
C. explosion
D. yellow flame
Correct Answer: B
---
172.
The metal that reacts explosively even with cold water is:
A. Ca
B. Mg
C. K
D. Zn
Correct Answer: C
---
173.
Hydrogen is placed separately in the periodic table because it:
A. shows properties of both Group 1 and Group 17
B. is a gas
C. has atomic number 1
D. is very reactive
Correct Answer: A
---
174.
The hydride LiAlH₄ is an example of:
A. saline hydride
B. covalent hydride
C. complex hydride
D. metallic hydride
Correct Answer: C
---
175.
Hydrogen is used in the manufacture of:
A. NH₃
B. CH₃OH
C. HCl
D. all of the above
Correct Answer: D
---
176.
The equation for Bosch process stage 1 is:
A. C + H₂O → CO + H₂
B. CO + H₂O → CO₂ + H₂
C. CO₂ + NaOH → Na₂CO₃ + H₂O
D. C + O₂ → CO₂
Correct Answer: A
---
177.
The catalyst in stage 2 of Bosch process is usually:
A. Fe₂O₃ promoted with Cr₂O₃
B. V₂O₅
C. Ni
D. Pt
Correct Answer: A
---
178.
The final purification step in Bosch process uses:
A. water
B. alkaline pyrogallol
C. NaOH or KOH solution
D. CuSO₄ solution
Correct Answer: C
---
179.
Hydrogen is used in atomic hydrogen torch to produce temperature up to:
A. 2000 °C
B. 2800 °C
C. 4000 °C
D. 6000 °C
Correct Answer: C
---
180.
The pop sound is due to:
A. rapid combustion of H₂ with oxygen present in the jar
B. cooling of gas
C. reduction of air
D. expansion of water
Correct Answer: A
---
181.
Hydrogen is not used in filling balloons nowadays because it is:
A. expensive
B. highly flammable
C. heavier than air
D. reactive with rubber
Correct Answer: B
A. forms H⁻ ion
B. is diatomic
C. needs one electron to complete octet
D. all of the above
Correct Answer: D
---
166.
The gas jar is inverted over the delivery tube in zinc + acid method to:
A. collect hydrogen by downward displacement of water
B. prevent escape of gas
C. cool the gas
D. dry the gas
Correct Answer: A
---
167.
When zinc reacts with dilute H₂SO₄, the zinc sulphate formed is:
A. ZnSO₄
B. Zn₂SO₄
C. Zn(SO₄)₂
D. ZnSO₃
Correct Answer: A
---
168.
The common impurity removed by passing hydrogen through acidified copper(II) sulphate solution is:
A. H₂S
B. AsH₃
C. PH₃
D. all of the above
Correct Answer: D
---
169.
Hydrogen is a better reducing agent than carbon monoxide at high temperature because:
A. it is lighter
B. reaction is more exothermic
C. it is cheaper
D. it is pure
Correct Answer: B
---
170.
The hydride used in airships in the past was:
A. hydrogen
B. helium
C. ammonia
D. methane
Correct Answer: A
---
171.
The test for purity of hydrogen is that it burns with:
A. pop sound
B. pale blue flame and no pop
C. explosion
D. yellow flame
Correct Answer: B
---
172.
The metal that reacts explosively even with cold water is:
A. Ca
B. Mg
C. K
D. Zn
Correct Answer: C
---
173.
Hydrogen is placed separately in the periodic table because it:
A. shows properties of both Group 1 and Group 17
B. is a gas
C. has atomic number 1
D. is very reactive
Correct Answer: A
---
174.
The hydride LiAlH₄ is an example of:
A. saline hydride
B. covalent hydride
C. complex hydride
D. metallic hydride
Correct Answer: C
---
175.
Hydrogen is used in the manufacture of:
A. NH₃
B. CH₃OH
C. HCl
D. all of the above
Correct Answer: D
---
176.
The equation for Bosch process stage 1 is:
A. C + H₂O → CO + H₂
B. CO + H₂O → CO₂ + H₂
C. CO₂ + NaOH → Na₂CO₃ + H₂O
D. C + O₂ → CO₂
Correct Answer: A
---
177.
The catalyst in stage 2 of Bosch process is usually:
A. Fe₂O₃ promoted with Cr₂O₃
B. V₂O₅
C. Ni
D. Pt
Correct Answer: A
---
178.
The final purification step in Bosch process uses:
A. water
B. alkaline pyrogallol
C. NaOH or KOH solution
D. CuSO₄ solution
Correct Answer: C
---
179.
Hydrogen is used in atomic hydrogen torch to produce temperature up to:
A. 2000 °C
B. 2800 °C
C. 4000 °C
D. 6000 °C
Correct Answer: C
---
180.
The pop sound is due to:
A. rapid combustion of H₂ with oxygen present in the jar
B. cooling of gas
C. reduction of air
D. expansion of water
Correct Answer: A
---
181.
Hydrogen is not used in filling balloons nowadays because it is:
A. expensive
B. highly flammable
C. heavier than air
D. reactive with rubber
Correct Answer: B
❤1
*CHLORINE QUESTIONS*
1.
Chlorine is a greenish-yellow gas with a:
A. pleasant smell
B. choking irritating smell
C. sweet smell
D. no smell
Correct Answer: B
---
2.
Chlorine is moderately soluble in water and the solution is called:
A. chlorine water
B. hydrochloric acid
C. hypochlorous acid
D. bleach
Correct Answer: A
---
3.
The laboratory preparation of chlorine uses MnO₂ + conc. HCl because MnO₂ acts as:
A. catalyst
B. dehydrating agent
C. oxidising agent
D. reducing agent
Correct Answer: C
---
4.
In the laboratory preparation, the all-glass apparatus is used because chlorine:
A. is poisonous
B. reacts with rubber/cork
C. is coloured
D. is dense
Correct Answer: B
---
5.
The gas collected by downward delivery in chlorine preparation is:
A. hydrogen
B. oxygen
C. chlorine
D. hydrogen chloride
Correct Answer: C
---
6.
Chlorine is dried using concentrated H₂SO₄ because:
A. it is cheap
B. it does not react with chlorine
C. it absorbs moisture fast
D. both B and C
Correct Answer: D
---
7.
The industrial preparation of chlorine is by:
A. electrolysis of brine
B. Downs process
C. heating MnO₂ + HCl
D. reaction of NaCl + H₂SO₄
Correct Answer: A
---
8.
The anode reaction in the electrolysis of brine is:
A. 2Cl⁻ → Cl₂ + 2e⁻
B. 2H₂O → O₂ + 4H⁺ + 4e⁻
C. Na⁺ + e⁻ → Na
D. 2H⁺ + 2e⁻ → H₂
Correct Answer: A
---
9.
Chlorine turns moist blue litmus paper:
A. red then bleaches it
B. permanently red
C. blue
D. green
Correct Answer: A
---
10.
The bleaching action of chlorine is due to:
A. oxidation
B. reduction
C. chlorination
D. dehydration
Correct Answer: A
---
11.
Chlorine water exposed to sunlight slowly turns into:
A. HCl + O
B. HOCl
C. HCl + O₂
D. Cl₂ + H₂O
Correct Answer: C
---
12.
Chlorine reacts vigorously with hydrogen after:
A. heating
B. exposure to sunlight
C. cooling
D. adding catalyst
Correct Answer: B
---
13.
The reaction 2Fe + 3Cl₂ → 2FeCl₃ shows chlorine acting as:
A. oxidising agent
B. reducing agent
C. bleaching agent
D. catalyst
Correct Answer: A
---
14.
Chlorine does NOT react with dry ammonia but reacts explosively with:
A. excess ammonia
B. limited ammonia
C. moist ammonia
D. cold ammonia
Correct Answer: B
---
15.
When excess ammonia reacts with chlorine, the product is:
A. NH₄Cl
B. N₂ + HCl
C. NCl₃
D. NH₂Cl
Correct Answer: B
---
16.
Hydrogen chloride gas is prepared in the laboratory by:
A. NaCl + conc. H₂SO₄ (heat)
B. MnO₂ + HCl
C. electrolysis of brine
D. heating NaCl alone
Correct Answer: A
---
17.
HCl gas turns moist blue litmus paper:
A. red
B. white
C. colourless
D. no change
Correct Answer: A
---
18.
The fountain experiment with HCl gas uses:
A. water
B. ammonia solution
C. NaOH solution
D. silver nitrate
Correct Answer: A
---
19.
HCl gas is extremely soluble in water because it:
A. is polar
B. reacts to form H₃O⁺ and Cl⁻
C. is light
D. is coloured
Correct Answer: B
---
20.
Hydrochloric acid is a strong acid because it:
A. is fully ionised in water
B. contains chlorine
C. is concentrated
D. is corrosive
Correct Answer: A
---
21.
Dilute HCl reacts with marble chips to produce:
A. CO₂
B. H₂
C. Cl₂
D. O₂
Correct Answer: A
---
22.
Concentrated HCl oxidises Fe²⁺ to Fe³⁺ and itself is reduced to:
A. Cl₂
B. HOCl
C. Cl⁻
D. HClO₃
Correct Answer: A
---
23.
Aqua regia is a mixture of conc. HCl and conc. HNO₃ in the ratio:
A. 3:1
B. 1:3
C. 1:1
D. 2:1
Correct Answer: A
---
24.
Aqua regia dissolves gold because it produces:
A. nascent chlorine
B. oxygen
C. H⁺ ions
D. NO₂
Correct Answer: A
---
25.
Chlorine displaces iodine from KI solution because chlorine is:
A. more electronegative
B. stronger oxidising agent
C. denser
D. greener
Correct Answer: B
---
26.
The order of reactivity (decreasing) among halogens is:
A. F > Cl > Br > I
B. I > Br > Cl > F
C. Cl > F > Br > I
D. Br > I > Cl > F
Correct Answer: A
---
27.
1.
Chlorine is a greenish-yellow gas with a:
A. pleasant smell
B. choking irritating smell
C. sweet smell
D. no smell
Correct Answer: B
---
2.
Chlorine is moderately soluble in water and the solution is called:
A. chlorine water
B. hydrochloric acid
C. hypochlorous acid
D. bleach
Correct Answer: A
---
3.
The laboratory preparation of chlorine uses MnO₂ + conc. HCl because MnO₂ acts as:
A. catalyst
B. dehydrating agent
C. oxidising agent
D. reducing agent
Correct Answer: C
---
4.
In the laboratory preparation, the all-glass apparatus is used because chlorine:
A. is poisonous
B. reacts with rubber/cork
C. is coloured
D. is dense
Correct Answer: B
---
5.
The gas collected by downward delivery in chlorine preparation is:
A. hydrogen
B. oxygen
C. chlorine
D. hydrogen chloride
Correct Answer: C
---
6.
Chlorine is dried using concentrated H₂SO₄ because:
A. it is cheap
B. it does not react with chlorine
C. it absorbs moisture fast
D. both B and C
Correct Answer: D
---
7.
The industrial preparation of chlorine is by:
A. electrolysis of brine
B. Downs process
C. heating MnO₂ + HCl
D. reaction of NaCl + H₂SO₄
Correct Answer: A
---
8.
The anode reaction in the electrolysis of brine is:
A. 2Cl⁻ → Cl₂ + 2e⁻
B. 2H₂O → O₂ + 4H⁺ + 4e⁻
C. Na⁺ + e⁻ → Na
D. 2H⁺ + 2e⁻ → H₂
Correct Answer: A
---
9.
Chlorine turns moist blue litmus paper:
A. red then bleaches it
B. permanently red
C. blue
D. green
Correct Answer: A
---
10.
The bleaching action of chlorine is due to:
A. oxidation
B. reduction
C. chlorination
D. dehydration
Correct Answer: A
---
11.
Chlorine water exposed to sunlight slowly turns into:
A. HCl + O
B. HOCl
C. HCl + O₂
D. Cl₂ + H₂O
Correct Answer: C
---
12.
Chlorine reacts vigorously with hydrogen after:
A. heating
B. exposure to sunlight
C. cooling
D. adding catalyst
Correct Answer: B
---
13.
The reaction 2Fe + 3Cl₂ → 2FeCl₃ shows chlorine acting as:
A. oxidising agent
B. reducing agent
C. bleaching agent
D. catalyst
Correct Answer: A
---
14.
Chlorine does NOT react with dry ammonia but reacts explosively with:
A. excess ammonia
B. limited ammonia
C. moist ammonia
D. cold ammonia
Correct Answer: B
---
15.
When excess ammonia reacts with chlorine, the product is:
A. NH₄Cl
B. N₂ + HCl
C. NCl₃
D. NH₂Cl
Correct Answer: B
---
16.
Hydrogen chloride gas is prepared in the laboratory by:
A. NaCl + conc. H₂SO₄ (heat)
B. MnO₂ + HCl
C. electrolysis of brine
D. heating NaCl alone
Correct Answer: A
---
17.
HCl gas turns moist blue litmus paper:
A. red
B. white
C. colourless
D. no change
Correct Answer: A
---
18.
The fountain experiment with HCl gas uses:
A. water
B. ammonia solution
C. NaOH solution
D. silver nitrate
Correct Answer: A
---
19.
HCl gas is extremely soluble in water because it:
A. is polar
B. reacts to form H₃O⁺ and Cl⁻
C. is light
D. is coloured
Correct Answer: B
---
20.
Hydrochloric acid is a strong acid because it:
A. is fully ionised in water
B. contains chlorine
C. is concentrated
D. is corrosive
Correct Answer: A
---
21.
Dilute HCl reacts with marble chips to produce:
A. CO₂
B. H₂
C. Cl₂
D. O₂
Correct Answer: A
---
22.
Concentrated HCl oxidises Fe²⁺ to Fe³⁺ and itself is reduced to:
A. Cl₂
B. HOCl
C. Cl⁻
D. HClO₃
Correct Answer: A
---
23.
Aqua regia is a mixture of conc. HCl and conc. HNO₃ in the ratio:
A. 3:1
B. 1:3
C. 1:1
D. 2:1
Correct Answer: A
---
24.
Aqua regia dissolves gold because it produces:
A. nascent chlorine
B. oxygen
C. H⁺ ions
D. NO₂
Correct Answer: A
---
25.
Chlorine displaces iodine from KI solution because chlorine is:
A. more electronegative
B. stronger oxidising agent
C. denser
D. greener
Correct Answer: B
---
26.
The order of reactivity (decreasing) among halogens is:
A. F > Cl > Br > I
B. I > Br > Cl > F
C. Cl > F > Br > I
D. Br > I > Cl > F
Correct Answer: A
---
27.
The test for chloride ions using silver nitrate gives a white precipitate that is:
A. soluble in excess NH₃
B. insoluble in dilute HNO₃
C. turns black in light
D. soluble in excess HCl
Correct Answer: A
---
28.
Hydrogen chloride fumes in moist air because it:
A. is dense
B. reacts with water vapour
C. is coloured
D. is poisonous
Correct Answer: B
---
29.
Chlorine is used in water treatment to:
A. kill germs
B. remove hardness
C. add taste
D. colour water
Correct Answer: A
---
30.
Bleaching powder is chemically:
A. Ca(OCl)Cl
B. CaOCl₂
C. CaCl₂
D. Ca(OCl)₂
Correct Answer: B
(Also written as Ca(OCl)Cl)
---
98.
The reaction Cl₂ + H₂O ⇌ HCl + HOCl is favoured by:
A. sunlight
B. darkness and cold
C. heating
D. pressure
Correct Answer: B
---
99.
Chlorine is stored in steel cylinders under pressure in:
A. gaseous form
B. liquid form
C. solid form
D. aqueous form
Correct Answer: B
---
100.
The most electronegative halogen is:
A. iodine
B. bromine
C. chlorine
D. fluorine
Correct Answer: D
A. soluble in excess NH₃
B. insoluble in dilute HNO₃
C. turns black in light
D. soluble in excess HCl
Correct Answer: A
---
28.
Hydrogen chloride fumes in moist air because it:
A. is dense
B. reacts with water vapour
C. is coloured
D. is poisonous
Correct Answer: B
---
29.
Chlorine is used in water treatment to:
A. kill germs
B. remove hardness
C. add taste
D. colour water
Correct Answer: A
---
30.
Bleaching powder is chemically:
A. Ca(OCl)Cl
B. CaOCl₂
C. CaCl₂
D. Ca(OCl)₂
Correct Answer: B
(Also written as Ca(OCl)Cl)
---
98.
The reaction Cl₂ + H₂O ⇌ HCl + HOCl is favoured by:
A. sunlight
B. darkness and cold
C. heating
D. pressure
Correct Answer: B
---
99.
Chlorine is stored in steel cylinders under pressure in:
A. gaseous form
B. liquid form
C. solid form
D. aqueous form
Correct Answer: B
---
100.
The most electronegative halogen is:
A. iodine
B. bromine
C. chlorine
D. fluorine
Correct Answer: D
*CONTINUETION*
101. The reaction between chlorine and cold dilute NaOH produces
A. NaCl + NaOCl + H₂O
B. NaCl + NaClO₃ + H₂O
C. NaCl + HCl
D. NaClO₄
Correct Answer: A
---
102. The reaction between chlorine and hot concentrated NaOH produces
A. NaCl + NaClO₃ + H₂O
B. NaCl + NaOCl + H₂O
C. NaCl only
D. NaClO₄
Correct Answer: A
---
103. Chlorine reacts with slaked lime Ca(OH)₂ to form
A. Bleaching powder
B. Chalk
C. Plaster of Paris
D. Quicklime
Correct Answer: A
---
104. Bleaching powder reacts with dilute acid to liberate
A. Cl₂
B. O₂
C. HCl
D. HOCl
Correct Answer: A
---
105. The bleaching action of bleaching powder is due to
A. Cl₂
B. Nascent oxygen
C. HOCl
D. Ca(OH)₂
Correct Answer: A
---
106. Chlorine oxidises bromide ions to bromine because
A. Br⁻ is larger than Cl⁻
B. Chlorine is above bromine in the electrochemical series
C. Bromine is a liquid
D. Chlorine is green
Correct Answer: B
---
107. A reddish-brown vapour evolved when chlorine water is added to KI solution is
A. Bromine
B. Iodine
C. Hydrogen iodide
D. Oxygen
Correct Answer: B
---
108. Chlorine water + iodide → iodine. This shows chlorine is
A. Reducing agent
B. Oxidising agent
C. Bleaching agent
D. Dehydrating agent
Correct Answer: B
---
109. The only halogen that is a good conductor of electricity in molten state is
A. Chlorine
B. Bromine
C. Iodine
D. Fluorine
Correct Answer: C
---
110. Hydrogen chloride is NOT dried using
A. Conc. H₂SO₄
B. P₂O₅
C. CaO
D. NaOH pellets
Correct Answer: C
---
111. The white precipitate formed when AgNO₃ is added to NaCl solution is
A. AgCl
B. AgNO₃
C. NaNO₃
D. Cl₂
Correct Answer: A
---
112. AgCl precipitate dissolves in excess
A. Dilute HNO₃
B. Dilute NH₃
C. Dilute HCl
D. Water
Correct Answer: B
---
113. The test to distinguish chloride from iodide using Pb(CH₃COO)₂ gives
A. White ppt for Cl⁻, yellow ppt for I⁻
B. Yellow ppt for Cl⁻, white ppt for I⁻
C. Both white
D. Both yellow
Correct Answer: A
---
114. Chlorine has strong oxidising power among halogens because it has
A. Small atomic size
B. High electronegativity after fluorine
C. Low electron affinity
D. High boiling point
Correct Answer: B
---
115. The reaction 2KI + Cl₂ → 2KCl + I₂ is an example of
A. Displacement
B. Combination
C. Neutralisation
D. Decomposition
Correct Answer: A
---
116. Chlorine is used in the manufacture of
A. HCl
B. Bleaching powder
C. PVC
D. All of the above
Correct Answer: D
---
117. The laboratory test for HCl gas is that it
A. Turns lime water milky
B. Gives white fumes with ammonia
C. Burns with pop sound
D. Relights glowing splint
Correct Answer: B
---
118. Concentrated HCl is a stronger oxidising agent than dilute HCl because
A. It contains more H⁺
B. It can liberate Cl₂
C. It is denser
D. It is colourless
Correct Answer: B
---
119. The gas that bleaches by reduction is
A. Cl₂
B. SO₂
C. O₂
D. H₂S
Correct Answer: B
---
120. Chlorine reacts with turpentine (C₁₀H₁₆) to
A. Burn violently
B. Produce HCl
C. Form addition compound
D. No reaction
Correct Answer: A
---
121. The colour of chlorine gas disappears when passed through heated iron filings because
A. Iron is oxidised to FeCl₃
B. Chlorine is reduced
C. Adsorption occurs
D. Sublimation occurs
Correct Answer: A
---
122. The most stable oxidation state of chlorine in its compounds is
A. +7
B. +5
C. –1
D. +1
Correct Answer: C
---
123. Chlorine is NOT used for
A. Sterilising swimming pools
B. Making fire extinguishers
C. Manufacturing dyes
D. Softening hard water
Correct Answer: D
---
124. The reaction Cl₂ + 8NH₃ (excess) → 6NH₄Cl + N₂ shows
A. Reduction of chlorine
B. Oxidation of ammonia
C. Both
D. Neither
Correct Answer: C
---
125. The compound formed when chlorine reacts with dry slaked lime is
A. CaCl₂
B. Ca(OCl)₂
C. Ca(OCl)Cl
D. CaClO₃
Correct Answer: C
---
126. Hydrochloric acid reacts with ammonia solution to form white fumes of
A. NH₄Cl
B. NH₄OH
C. NCl₃
D. HCl gas
Correct Answer: A
---
127. The reaction MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O shows MnO₂ acting as
101. The reaction between chlorine and cold dilute NaOH produces
A. NaCl + NaOCl + H₂O
B. NaCl + NaClO₃ + H₂O
C. NaCl + HCl
D. NaClO₄
Correct Answer: A
---
102. The reaction between chlorine and hot concentrated NaOH produces
A. NaCl + NaClO₃ + H₂O
B. NaCl + NaOCl + H₂O
C. NaCl only
D. NaClO₄
Correct Answer: A
---
103. Chlorine reacts with slaked lime Ca(OH)₂ to form
A. Bleaching powder
B. Chalk
C. Plaster of Paris
D. Quicklime
Correct Answer: A
---
104. Bleaching powder reacts with dilute acid to liberate
A. Cl₂
B. O₂
C. HCl
D. HOCl
Correct Answer: A
---
105. The bleaching action of bleaching powder is due to
A. Cl₂
B. Nascent oxygen
C. HOCl
D. Ca(OH)₂
Correct Answer: A
---
106. Chlorine oxidises bromide ions to bromine because
A. Br⁻ is larger than Cl⁻
B. Chlorine is above bromine in the electrochemical series
C. Bromine is a liquid
D. Chlorine is green
Correct Answer: B
---
107. A reddish-brown vapour evolved when chlorine water is added to KI solution is
A. Bromine
B. Iodine
C. Hydrogen iodide
D. Oxygen
Correct Answer: B
---
108. Chlorine water + iodide → iodine. This shows chlorine is
A. Reducing agent
B. Oxidising agent
C. Bleaching agent
D. Dehydrating agent
Correct Answer: B
---
109. The only halogen that is a good conductor of electricity in molten state is
A. Chlorine
B. Bromine
C. Iodine
D. Fluorine
Correct Answer: C
---
110. Hydrogen chloride is NOT dried using
A. Conc. H₂SO₄
B. P₂O₅
C. CaO
D. NaOH pellets
Correct Answer: C
---
111. The white precipitate formed when AgNO₃ is added to NaCl solution is
A. AgCl
B. AgNO₃
C. NaNO₃
D. Cl₂
Correct Answer: A
---
112. AgCl precipitate dissolves in excess
A. Dilute HNO₃
B. Dilute NH₃
C. Dilute HCl
D. Water
Correct Answer: B
---
113. The test to distinguish chloride from iodide using Pb(CH₃COO)₂ gives
A. White ppt for Cl⁻, yellow ppt for I⁻
B. Yellow ppt for Cl⁻, white ppt for I⁻
C. Both white
D. Both yellow
Correct Answer: A
---
114. Chlorine has strong oxidising power among halogens because it has
A. Small atomic size
B. High electronegativity after fluorine
C. Low electron affinity
D. High boiling point
Correct Answer: B
---
115. The reaction 2KI + Cl₂ → 2KCl + I₂ is an example of
A. Displacement
B. Combination
C. Neutralisation
D. Decomposition
Correct Answer: A
---
116. Chlorine is used in the manufacture of
A. HCl
B. Bleaching powder
C. PVC
D. All of the above
Correct Answer: D
---
117. The laboratory test for HCl gas is that it
A. Turns lime water milky
B. Gives white fumes with ammonia
C. Burns with pop sound
D. Relights glowing splint
Correct Answer: B
---
118. Concentrated HCl is a stronger oxidising agent than dilute HCl because
A. It contains more H⁺
B. It can liberate Cl₂
C. It is denser
D. It is colourless
Correct Answer: B
---
119. The gas that bleaches by reduction is
A. Cl₂
B. SO₂
C. O₂
D. H₂S
Correct Answer: B
---
120. Chlorine reacts with turpentine (C₁₀H₁₆) to
A. Burn violently
B. Produce HCl
C. Form addition compound
D. No reaction
Correct Answer: A
---
121. The colour of chlorine gas disappears when passed through heated iron filings because
A. Iron is oxidised to FeCl₃
B. Chlorine is reduced
C. Adsorption occurs
D. Sublimation occurs
Correct Answer: A
---
122. The most stable oxidation state of chlorine in its compounds is
A. +7
B. +5
C. –1
D. +1
Correct Answer: C
---
123. Chlorine is NOT used for
A. Sterilising swimming pools
B. Making fire extinguishers
C. Manufacturing dyes
D. Softening hard water
Correct Answer: D
---
124. The reaction Cl₂ + 8NH₃ (excess) → 6NH₄Cl + N₂ shows
A. Reduction of chlorine
B. Oxidation of ammonia
C. Both
D. Neither
Correct Answer: C
---
125. The compound formed when chlorine reacts with dry slaked lime is
A. CaCl₂
B. Ca(OCl)₂
C. Ca(OCl)Cl
D. CaClO₃
Correct Answer: C
---
126. Hydrochloric acid reacts with ammonia solution to form white fumes of
A. NH₄Cl
B. NH₄OH
C. NCl₃
D. HCl gas
Correct Answer: A
---
127. The reaction MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O shows MnO₂ acting as
A. Oxidising agent
B. Reducing agent
C. Catalyst
D. Dehydrating agent
Correct Answer: A
---
128. In the Downs cell, chlorine is produced at the
A. Steel cathode
B. Graphite anode
C. Mercury cathode
D. Iron cathode
Correct Answer: B
---
129. Chlorine is a stronger oxidising agent than iodine because its
A. Electron affinity is higher
B. Atomic radius is larger
C. Ionisation energy is higher
D. Density is lower
Correct Answer: A
---
130. The halogen that forms a pale yellow precipitate with AgNO₃ is
A. Cl⁻
B. Br⁻
C. I⁻
D. F⁻
Correct Answer: B
---
131. The precipitate of AgI is
A. White
B. Cream
C. Pale yellow
D. Bright yellow
Correct Answer: D
---
132. Chlorine water acts as a bleaching agent only in the presence of
A. Sunlight
B. Moisture
C. Heat
D. CO₂
Correct Answer: B
---
133. The equation for the bleaching action is
A. Cl₂ + H₂O → 2HCl + [O]
B. HOCl → HCl + [O]
C. Both
D. Neither
Correct Answer: C
---
134. Chlorine is stored in amber-coloured bottles because
A. It prevents decomposition by light
B. It looks better
C. Glass reacts
D. It is cheaper
Correct Answer: A
---
135. The correct products when chlorine reacts with cold dilute NaOH are
A. NaCl + NaOCl + H₂O
B. NaCl + NaClO₃ + H₂O
C. NaClO only
D. NaClO₄
Correct Answer: A
---
136. The gas that gives dense white fumes with HCl gas is
A. NH₃
B. SO₂
C. CO₂
D. H₂S
Correct Answer: A
---
137. Chlorine is NOT liberated when conc. HCl reacts with
A. KMnO₄
B. PbO₂
C. K₂Cr₂O₇
D. NaOH
Correct Answer: D
---
138. The most reactive halogen towards substitution reactions is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: A
---
139. Hydrogen chloride behaves as ionic in
A. Gas phase
B. Aqueous solution
C. Molten state
D. Solid state
Correct Answer: B
---
140. The only halogen acid that is a weak acid is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: A
---
141. Chlorine displaces bromine from NaBr because
A. Cl₂ is gas, Br₂ is liquid
B. Cl₂ has higher reduction potential
C. NaBr is soluble
D. Bromine is coloured
Correct Answer: B
---
142. The colour of iodine vapour is
A. Violet
B. Brown
C. Purple
D. Reddish
Correct Answer: A
---
143. The test for chloride ions in the presence of bromide and iodide is difficult because
A. All give precipitates with AgNO₃
B. AgCl is soluble
C. Iodine is coloured
D. Bromine is volatile
Correct Answer: A
---
144. Chlorine is used as a germicide because it
A. Oxidises bacteria
B. Coagulates proteins
C. Both
D. Neither
Correct Answer: C
---
145. The reaction Cl₂ + 2NaBr → 2NaCl + Br₂ is
A. Redox
B. Displacement
C. Both
D. Neutralisation
Correct Answer: C
---
146. Chlorine is a non-metal because it
A. Gains electrons
B. Has high electronegativity
C. Forms acidic oxides
D. All of the above
Correct Answer: D
---
147. The strongest halogen acid is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: D
---
148. The weakest bond in HX is
A. H–F
B. H–Cl
C. H–Br
D. H–I
Correct Answer: D
---
149. Chlorine is manufactured commercially by
A. Electrolysis of brine
B. Heating NaCl + MnO₂
C. Action of HCl on KMnO₄
D. All of the above
Correct Answer: A
B. Reducing agent
C. Catalyst
D. Dehydrating agent
Correct Answer: A
---
128. In the Downs cell, chlorine is produced at the
A. Steel cathode
B. Graphite anode
C. Mercury cathode
D. Iron cathode
Correct Answer: B
---
129. Chlorine is a stronger oxidising agent than iodine because its
A. Electron affinity is higher
B. Atomic radius is larger
C. Ionisation energy is higher
D. Density is lower
Correct Answer: A
---
130. The halogen that forms a pale yellow precipitate with AgNO₃ is
A. Cl⁻
B. Br⁻
C. I⁻
D. F⁻
Correct Answer: B
---
131. The precipitate of AgI is
A. White
B. Cream
C. Pale yellow
D. Bright yellow
Correct Answer: D
---
132. Chlorine water acts as a bleaching agent only in the presence of
A. Sunlight
B. Moisture
C. Heat
D. CO₂
Correct Answer: B
---
133. The equation for the bleaching action is
A. Cl₂ + H₂O → 2HCl + [O]
B. HOCl → HCl + [O]
C. Both
D. Neither
Correct Answer: C
---
134. Chlorine is stored in amber-coloured bottles because
A. It prevents decomposition by light
B. It looks better
C. Glass reacts
D. It is cheaper
Correct Answer: A
---
135. The correct products when chlorine reacts with cold dilute NaOH are
A. NaCl + NaOCl + H₂O
B. NaCl + NaClO₃ + H₂O
C. NaClO only
D. NaClO₄
Correct Answer: A
---
136. The gas that gives dense white fumes with HCl gas is
A. NH₃
B. SO₂
C. CO₂
D. H₂S
Correct Answer: A
---
137. Chlorine is NOT liberated when conc. HCl reacts with
A. KMnO₄
B. PbO₂
C. K₂Cr₂O₇
D. NaOH
Correct Answer: D
---
138. The most reactive halogen towards substitution reactions is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: A
---
139. Hydrogen chloride behaves as ionic in
A. Gas phase
B. Aqueous solution
C. Molten state
D. Solid state
Correct Answer: B
---
140. The only halogen acid that is a weak acid is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: A
---
141. Chlorine displaces bromine from NaBr because
A. Cl₂ is gas, Br₂ is liquid
B. Cl₂ has higher reduction potential
C. NaBr is soluble
D. Bromine is coloured
Correct Answer: B
---
142. The colour of iodine vapour is
A. Violet
B. Brown
C. Purple
D. Reddish
Correct Answer: A
---
143. The test for chloride ions in the presence of bromide and iodide is difficult because
A. All give precipitates with AgNO₃
B. AgCl is soluble
C. Iodine is coloured
D. Bromine is volatile
Correct Answer: A
---
144. Chlorine is used as a germicide because it
A. Oxidises bacteria
B. Coagulates proteins
C. Both
D. Neither
Correct Answer: C
---
145. The reaction Cl₂ + 2NaBr → 2NaCl + Br₂ is
A. Redox
B. Displacement
C. Both
D. Neutralisation
Correct Answer: C
---
146. Chlorine is a non-metal because it
A. Gains electrons
B. Has high electronegativity
C. Forms acidic oxides
D. All of the above
Correct Answer: D
---
147. The strongest halogen acid is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: D
---
148. The weakest bond in HX is
A. H–F
B. H–Cl
C. H–Br
D. H–I
Correct Answer: D
---
149. Chlorine is manufactured commercially by
A. Electrolysis of brine
B. Heating NaCl + MnO₂
C. Action of HCl on KMnO₄
D. All of the above
Correct Answer: A
*CONTINUETION LAST*
150. The colour of bromine water is
A. Greenish-yellow
B. Reddish-brown
C. Violet
D. Pale yellow
Correct Answer: B
---
151. Bromine is liberated when chlorine is passed through a solution of
A. NaCl
B. NaBr
C. NaI
D. NaF
Correct Answer: B
---
152. Iodine is liberated from KI solution by
A. Chlorine only
B. Bromine only
C. Both chlorine and bromine
D. Fluorine only
Correct Answer: C
---
153. The halogen that is a solid at room temperature is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: D
---
154. The only halogen that is liquid at room temperature is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: C
---
155. The solubility of halogens in water decreases in the order
A. F₂ > Cl₂ > Br₂ > I₂
B. I₂ > Br₂ > Cl₂ > F₂
C. Cl₂ > Br₂ > I₂ > F₂
D. F₂ > I₂ > Br₂ > Cl₂
Correct Answer: C
---
156. The halogen with the highest electronegativity is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: A
---
157. The bond energy of H–X decreases from HF to HI because
A. Atomic size increases
B. Electronegativity decreases
C. Bond length increases
D. All of the above
Correct Answer: D
---
158. HF is a weak acid while HCl, HBr, and HI are strong acids because
A. H–F bond is strongest
B. F⁻ is smallest
C. HF does not ionise completely
D. All of the above
Correct Answer: D
---
159. The reaction 2NaI + Cl₂ → 2NaCl + I₂ shows iodine has been
A. Oxidised
B. Reduced
C. Displaced
D. Both A and C
Correct Answer: D
---
160. Chlorine reacts with excess cold dilute alkali to form
A. Hypochlorite
B. Chlorate(V)
C. Chlorate(VII)
D. Chloride only
Correct Answer: A
---
161. Chlorine reacts with hot concentrated alkali to form
A. Hypochlorite
B. Chlorate(V)
C. Chloride only
D. Perchlorate
Correct Answer: B
---
162. The formula of bleaching powder is
A. CaOCl₂
B. Ca(OCl)Cl
C. CaCl₂
D. Both A and B
Correct Answer: D
---
163. Bleaching powder liberates chlorine with
A. Dilute acids
B. CO₂
C. Both A and B
D. Water only
Correct Answer: C
---
164. The test for chloride ion after adding dilute HNO₃ and AgNO₃ gives
A. White ppt soluble in NH₃
B. Cream ppt sparingly soluble in NH₃
C. Yellow ppt insoluble in NH₃
D. No ppt
Correct Answer: A
---
165. The test for bromide ion gives
A. White ppt
B. Cream/pale yellow ppt
C. Bright yellow ppt
D. Violet vapour
Correct Answer: B
---
166. The test for iodide ion gives
A. Cream ppt
B. Yellow ppt insoluble in excess NH₃
C. White ppt
D. Blue-black colour with starch
Correct Answer: B
---
167. Chlorine water + starch-iodide paper turns
A. Blue-black
B. Red
C. Green
D. Colourless
Correct Answer: A
---
168. The most powerful bleaching agent among halogens is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: A
---
169. Chlorine is used in the manufacture of
A. HCl
B. PVC
C. Chloroform
D. All of the above
Correct Answer: D
---
170. Hydrogen chloride gas can be distinguished from chlorine because HCl
A. Gives white fumes with ammonia
B. Bleaches litmus
C. Is greenish-yellow
D. Supports combustion
Correct Answer: A
---
171. The reaction of chlorine with dry slaked lime produces
A. CaCl₂
B. Bleaching powder
C. Ca(ClO₃)₂
D. CaO
Correct Answer: B
---
172. The formula of hypochlorous acid is
A. HClO
B. HClO₂
C. HClO₃
D. HClO₄
Correct Answer: A
---
173. Chlorine is a stronger oxidising agent than bromine because
A. Its reduction potential is higher
B. It is lighter
C. It is a gas
D. It is cheaper
Correct Answer: A
---
174. The decreasing order of oxidising power of halogens is
A. F₂ > Cl₂ > Br₂ > I₂
B. I₂ > Br₂ > Cl₂ > F₂
C. Cl₂ > F₂ > Br₂ > I₂
D. Br₂ > I₂ > Cl₂ > F₂
Correct Answer: A
---
175. Aqua regia contains
A. 3 parts conc. HCl + 1 part conc. HNO₃
B. 1 part conc. HCl + 3 parts conc. HNO₃
C. Equal parts
D. Only HCl
Correct Answer: A
---
176. Nascent chlorine is produced in
A. Laboratory preparation
B. Aqua regia
C. Bleaching powder + acid
D. All of the above
Correct Answer: D
---
177. Chlorine does NOT react with
150. The colour of bromine water is
A. Greenish-yellow
B. Reddish-brown
C. Violet
D. Pale yellow
Correct Answer: B
---
151. Bromine is liberated when chlorine is passed through a solution of
A. NaCl
B. NaBr
C. NaI
D. NaF
Correct Answer: B
---
152. Iodine is liberated from KI solution by
A. Chlorine only
B. Bromine only
C. Both chlorine and bromine
D. Fluorine only
Correct Answer: C
---
153. The halogen that is a solid at room temperature is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: D
---
154. The only halogen that is liquid at room temperature is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: C
---
155. The solubility of halogens in water decreases in the order
A. F₂ > Cl₂ > Br₂ > I₂
B. I₂ > Br₂ > Cl₂ > F₂
C. Cl₂ > Br₂ > I₂ > F₂
D. F₂ > I₂ > Br₂ > Cl₂
Correct Answer: C
---
156. The halogen with the highest electronegativity is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: A
---
157. The bond energy of H–X decreases from HF to HI because
A. Atomic size increases
B. Electronegativity decreases
C. Bond length increases
D. All of the above
Correct Answer: D
---
158. HF is a weak acid while HCl, HBr, and HI are strong acids because
A. H–F bond is strongest
B. F⁻ is smallest
C. HF does not ionise completely
D. All of the above
Correct Answer: D
---
159. The reaction 2NaI + Cl₂ → 2NaCl + I₂ shows iodine has been
A. Oxidised
B. Reduced
C. Displaced
D. Both A and C
Correct Answer: D
---
160. Chlorine reacts with excess cold dilute alkali to form
A. Hypochlorite
B. Chlorate(V)
C. Chlorate(VII)
D. Chloride only
Correct Answer: A
---
161. Chlorine reacts with hot concentrated alkali to form
A. Hypochlorite
B. Chlorate(V)
C. Chloride only
D. Perchlorate
Correct Answer: B
---
162. The formula of bleaching powder is
A. CaOCl₂
B. Ca(OCl)Cl
C. CaCl₂
D. Both A and B
Correct Answer: D
---
163. Bleaching powder liberates chlorine with
A. Dilute acids
B. CO₂
C. Both A and B
D. Water only
Correct Answer: C
---
164. The test for chloride ion after adding dilute HNO₃ and AgNO₃ gives
A. White ppt soluble in NH₃
B. Cream ppt sparingly soluble in NH₃
C. Yellow ppt insoluble in NH₃
D. No ppt
Correct Answer: A
---
165. The test for bromide ion gives
A. White ppt
B. Cream/pale yellow ppt
C. Bright yellow ppt
D. Violet vapour
Correct Answer: B
---
166. The test for iodide ion gives
A. Cream ppt
B. Yellow ppt insoluble in excess NH₃
C. White ppt
D. Blue-black colour with starch
Correct Answer: B
---
167. Chlorine water + starch-iodide paper turns
A. Blue-black
B. Red
C. Green
D. Colourless
Correct Answer: A
---
168. The most powerful bleaching agent among halogens is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Correct Answer: A
---
169. Chlorine is used in the manufacture of
A. HCl
B. PVC
C. Chloroform
D. All of the above
Correct Answer: D
---
170. Hydrogen chloride gas can be distinguished from chlorine because HCl
A. Gives white fumes with ammonia
B. Bleaches litmus
C. Is greenish-yellow
D. Supports combustion
Correct Answer: A
---
171. The reaction of chlorine with dry slaked lime produces
A. CaCl₂
B. Bleaching powder
C. Ca(ClO₃)₂
D. CaO
Correct Answer: B
---
172. The formula of hypochlorous acid is
A. HClO
B. HClO₂
C. HClO₃
D. HClO₄
Correct Answer: A
---
173. Chlorine is a stronger oxidising agent than bromine because
A. Its reduction potential is higher
B. It is lighter
C. It is a gas
D. It is cheaper
Correct Answer: A
---
174. The decreasing order of oxidising power of halogens is
A. F₂ > Cl₂ > Br₂ > I₂
B. I₂ > Br₂ > Cl₂ > F₂
C. Cl₂ > F₂ > Br₂ > I₂
D. Br₂ > I₂ > Cl₂ > F₂
Correct Answer: A
---
175. Aqua regia contains
A. 3 parts conc. HCl + 1 part conc. HNO₃
B. 1 part conc. HCl + 3 parts conc. HNO₃
C. Equal parts
D. Only HCl
Correct Answer: A
---
176. Nascent chlorine is produced in
A. Laboratory preparation
B. Aqua regia
C. Bleaching powder + acid
D. All of the above
Correct Answer: D
---
177. Chlorine does NOT react with
A. Cold dilute NaOH
B. Hot concentrated NaOH
C. Dry ammonia
D. Moist ammonia
Correct Answer: C
---
178. The reaction Cl₂ + 3F₂ → 2ClF₃ shows fluorine acting as
A. Oxidising agent
B. Reducing agent
C. Both
D. Neither
Correct Answer: A
---
179. The halogen acid used in etching glass is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: A
---
180. Chlorine is transported as
A. Gas in cylinders
B. Liquid in tankers
C. Solid
D. Solution
Correct Answer: B
---
181. The compound Ca(OCl)₂ is called
A. Bleaching powder
B. Calcium hypochlorite
C. Chloride of lime
D. Both B and C
Correct Answer: D
---
182. Chlorine turns moist starch-iodide paper
A. Blue-black
B. Red
C. White
D. Yellow
Correct Answer: A
---
183. The final test for chloride after removing Br⁻ and I⁻ is
A. Chromyl chloride test
B. Silver nitrate test
C. Both
D. None
Correct Answer: A
---
184. Chromyl chloride test gives red fumes of
A. CrO₂Cl₂
B. Cl₂
C. HCl
D. CrCl₃
Correct Answer: A
---
185. The halogen with the largest atomic radius is
A. F
B. Cl
C. Br
D. I
Correct Answer: D
---
186. Hydrogen halides are generally prepared by
A. Direct combination
B. Action of conc. H₂SO₄ on NaX
C. Both
D. Only for HF
Correct Answer: C
---
187. HF cannot be prepared using conc. H₂SO₄ because
A. It reacts with glass
B. CaF₂ is insoluble
C. HF reduces H₂SO₄
D. HF is volatile
Correct Answer: C
---
188. The reaction 2KMnO₄ + 16HCl → 2KCl + 2MnCl₂ + 5Cl₂ + 8H₂O shows HCl acting as
A. Reducing agent
B. Oxidising agent
C. Acid only
D. None
Correct Answer: A
---
189. Chlorine is used as a
A. Bleaching agent
B. Disinfectant
C. In PVC manufacture
D. All of the above
Correct Answer: D
---
190. The halogen that sublimes to give violet vapour is
A. Cl₂
B. Br₂
C. I₂
D. F₂
Correct Answer: C
---
191. Chlorine is NOT used in
A. Swimming pools
B. Paper industry
C. Softening water
D. Making insecticides
Correct Answer: C
---
192. The most stable halide ion is
A. F⁻
B. Cl⁻
C. Br⁻
D. I⁻
Correct Answer: A
---
193. The reaction Cl₂ + H₂ → 2HCl is
A. Photochemical
B. Explosive in sunlight
C. Both
D. Reversible
Correct Answer: C
---
194. Chlorine is a member of
A. Group 1
B. Group 2
C. Group 17
D. Group 18
Correct Answer: C
---
195. The electronic configuration of chlorine is
A. 2,8,7
B. 2,8,8
C. 2,7
D. 2,8,1
Correct Answer: A
---
196. Chlorine exhibits oxidation states from
A. –1 to +7
B. 0 to +7
C. –1 only
D. +1 only
Correct Answer: A
---
197. The strongest acid among HX is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: D
---
198. The weakest acid among HX is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: A
---
199. Chlorine is dried in the laboratory using
A. Conc. H₂SO₄
B. CaCl₂
C. P₂O₅
D. All of the above
Correct Answer: A
---
200. The final product when bleaching powder is exposed to air for long is
A. CaCO₃
B. CaCl₂
C. Ca(OH)₂
D. CaSO₄
Correct Answer: A
B. Hot concentrated NaOH
C. Dry ammonia
D. Moist ammonia
Correct Answer: C
---
178. The reaction Cl₂ + 3F₂ → 2ClF₃ shows fluorine acting as
A. Oxidising agent
B. Reducing agent
C. Both
D. Neither
Correct Answer: A
---
179. The halogen acid used in etching glass is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: A
---
180. Chlorine is transported as
A. Gas in cylinders
B. Liquid in tankers
C. Solid
D. Solution
Correct Answer: B
---
181. The compound Ca(OCl)₂ is called
A. Bleaching powder
B. Calcium hypochlorite
C. Chloride of lime
D. Both B and C
Correct Answer: D
---
182. Chlorine turns moist starch-iodide paper
A. Blue-black
B. Red
C. White
D. Yellow
Correct Answer: A
---
183. The final test for chloride after removing Br⁻ and I⁻ is
A. Chromyl chloride test
B. Silver nitrate test
C. Both
D. None
Correct Answer: A
---
184. Chromyl chloride test gives red fumes of
A. CrO₂Cl₂
B. Cl₂
C. HCl
D. CrCl₃
Correct Answer: A
---
185. The halogen with the largest atomic radius is
A. F
B. Cl
C. Br
D. I
Correct Answer: D
---
186. Hydrogen halides are generally prepared by
A. Direct combination
B. Action of conc. H₂SO₄ on NaX
C. Both
D. Only for HF
Correct Answer: C
---
187. HF cannot be prepared using conc. H₂SO₄ because
A. It reacts with glass
B. CaF₂ is insoluble
C. HF reduces H₂SO₄
D. HF is volatile
Correct Answer: C
---
188. The reaction 2KMnO₄ + 16HCl → 2KCl + 2MnCl₂ + 5Cl₂ + 8H₂O shows HCl acting as
A. Reducing agent
B. Oxidising agent
C. Acid only
D. None
Correct Answer: A
---
189. Chlorine is used as a
A. Bleaching agent
B. Disinfectant
C. In PVC manufacture
D. All of the above
Correct Answer: D
---
190. The halogen that sublimes to give violet vapour is
A. Cl₂
B. Br₂
C. I₂
D. F₂
Correct Answer: C
---
191. Chlorine is NOT used in
A. Swimming pools
B. Paper industry
C. Softening water
D. Making insecticides
Correct Answer: C
---
192. The most stable halide ion is
A. F⁻
B. Cl⁻
C. Br⁻
D. I⁻
Correct Answer: A
---
193. The reaction Cl₂ + H₂ → 2HCl is
A. Photochemical
B. Explosive in sunlight
C. Both
D. Reversible
Correct Answer: C
---
194. Chlorine is a member of
A. Group 1
B. Group 2
C. Group 17
D. Group 18
Correct Answer: C
---
195. The electronic configuration of chlorine is
A. 2,8,7
B. 2,8,8
C. 2,7
D. 2,8,1
Correct Answer: A
---
196. Chlorine exhibits oxidation states from
A. –1 to +7
B. 0 to +7
C. –1 only
D. +1 only
Correct Answer: A
---
197. The strongest acid among HX is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: D
---
198. The weakest acid among HX is
A. HF
B. HCl
C. HBr
D. HI
Correct Answer: A
---
199. Chlorine is dried in the laboratory using
A. Conc. H₂SO₄
B. CaCl₂
C. P₂O₅
D. All of the above
Correct Answer: A
---
200. The final product when bleaching powder is exposed to air for long is
A. CaCO₃
B. CaCl₂
C. Ca(OH)₂
D. CaSO₄
Correct Answer: A
*SILICON*
1.
Silicon belongs to which group in the periodic table?
A) Group 13 B) Group 14 C) Group 15 D) Group 16
Answer: B
---
2.
Silicon is the ___ most abundant element in the Earth’s crust.
A) First B) Second C) Third D) Fourth
Answer: B
---
3.
Naturally occurring silicon exists mainly as
A) Free element
B) Silicon(IV) oxide and silicates
C) Silicon carbide
D) Silicon tetrachloride
Answer: B
---
4.
The common crystalline forms of silica are
A) Quartz, Tridymite, Cristobalite
B) Diamond, Graphite, Fullerene
C) Calcite, Aragonite, Marble
D) Rutile, Anatase, Brookite
Answer: A
---
5.
Silica gel is obtained by
A) Heating sand
B) Acidification of water-glass solution
C) Burning silicon in oxygen
D) Reducing SiO₂ with carbon
Answer: B
---
6.
Silica gel is commonly used in packaging of electronic items because
A) It keeps away rats and cockroaches
B) It is stable in porous packs
C) It is hygroscopic
D) Carbon and silicon have similar chemistry
Answer: C
---
7.
Silicon(IV) oxide is also known as
A) Sand
B) Silica
C) Quartz
D) All of these
Answer: D
---
8.
Silicon(IV) oxide is insoluble in water and all acids except
A) HCl B) H₂SO₄ C) HNO₃ D) HF
Answer: D
---
9.
The reaction of SiO₂ with HF produces
A) SiF₄ B) H₂SiF₆ C) SiCl₄ D) SiH₄
Answer: B
---
10.
Silicon(IV) oxide dissolves in hot concentrated alkali to form
A) Silicates
B) Silicides
C) Silicon carbide
D) Silicon hydride
Answer: A
---
11.
The melting point of silicon(IV) oxide is about
A) 500 °C B) 1000 °C C) 1500 °C D) 1710 °C
Answer: D (approximately 1710–1730 °C)
---
12.
Fused silica is used in making
A) Cement
B) Laboratory apparatus
C) Bricks
D) Paint
Answer: B
---
13.
Very pure silicon (99%+) is manufactured by heating sand with excess carbon in an electric furnace. The reaction is
A) SiO₂ + 2C → Si + 2CO
B) SiO₂ + C → Si + CO₂
C) SiO₂ + 2Mg → Si + 2MgO
D) SiO₂ + 4HCl → SiCl₄ + 2H₂O
Answer: A
---
14.
Amorphous silicon is prepared by
A) Heating sand with magnesium
B) Heating SiCl₄ with zinc
C) Burning silicon in oxygen
D) Reducing SiO₂ with aluminium
Answer: A
---
15.
Silicon does NOT exhibit the phenomenon of
A) Allotropy
B) Catenation
C) Multiple bonding
D) All of these
Answer: C
---
16.
Silicon is ___ reactive than carbon.
A) Less B) More C) Equally D) Not comparable
Answer: A
---
17.
When strongly heated in air, silicon forms
A) SiC B) Si₃N₄ C) SiO₂ D) SiH₄
Answer: C
---
18.
Silicon decomposes steam at red heat to liberate
A) Oxygen B) Hydrogen C) Carbon dioxide D) Nitrogen
Answer: B
---
19.
Silicon combines with chlorine under similar conditions to form
A) SiCl₄ B) SiH₄ C) SiO₂ D) SiC
Answer: A
---
20.
Graphite does NOT react with chlorine, but silicon does because
A) Silicon is larger in size
B) Silicon has vacant d-orbitals
C) Silicon is more metallic
D) Silicon has lower ionization energy
Answer: B
---
21.
Silicon is used in making semiconductors because
A) It is cheap
B) It can be very pure
C) It has variable valency
D) All of these
Answer: D
---
22.
Silicon is used in bronze and steel alloys to increase
A) Tensile strength
B) Ductility
C) Colour
D) Density
Answer: A
---
23.
Silicons (silicones) are
A) Rubber-like liquids or solids
B) Water and chemically unreactive
C) Used as lubricants, water repellents, insulators
D) All of these
Answer: D
---
24.
Silicon carbide (carborundum) is prepared by heating silica with carbon. Its formula is
A) SiC B) Si₂C C) SiC₂ D) Si₃C
Answer: A
---
25.
Silicon carbide is used as
A) Abrasive B) Lubricant C) Fertilizer D) Pigment
Answer: A
---
26.
Water-glass is a
A) Colloidal solution of silica
B) Viscous liquid of sodium silicate
C) Solid glass
D) Hydrated silica
Answer: B
---
27.
Water-glass is used for
A) Preserving eggs
B) Fire-proofing wood and textiles
C) Making silica garden
D) All of these
Answer: D
---
28.
Kieselguhr is
A) Pure silica
B) Porous and absorbent form of silica
C) Crystalline silica
D) Amorphous carbon
Answer: B
---
29.
1.
Silicon belongs to which group in the periodic table?
A) Group 13 B) Group 14 C) Group 15 D) Group 16
Answer: B
---
2.
Silicon is the ___ most abundant element in the Earth’s crust.
A) First B) Second C) Third D) Fourth
Answer: B
---
3.
Naturally occurring silicon exists mainly as
A) Free element
B) Silicon(IV) oxide and silicates
C) Silicon carbide
D) Silicon tetrachloride
Answer: B
---
4.
The common crystalline forms of silica are
A) Quartz, Tridymite, Cristobalite
B) Diamond, Graphite, Fullerene
C) Calcite, Aragonite, Marble
D) Rutile, Anatase, Brookite
Answer: A
---
5.
Silica gel is obtained by
A) Heating sand
B) Acidification of water-glass solution
C) Burning silicon in oxygen
D) Reducing SiO₂ with carbon
Answer: B
---
6.
Silica gel is commonly used in packaging of electronic items because
A) It keeps away rats and cockroaches
B) It is stable in porous packs
C) It is hygroscopic
D) Carbon and silicon have similar chemistry
Answer: C
---
7.
Silicon(IV) oxide is also known as
A) Sand
B) Silica
C) Quartz
D) All of these
Answer: D
---
8.
Silicon(IV) oxide is insoluble in water and all acids except
A) HCl B) H₂SO₄ C) HNO₃ D) HF
Answer: D
---
9.
The reaction of SiO₂ with HF produces
A) SiF₄ B) H₂SiF₆ C) SiCl₄ D) SiH₄
Answer: B
---
10.
Silicon(IV) oxide dissolves in hot concentrated alkali to form
A) Silicates
B) Silicides
C) Silicon carbide
D) Silicon hydride
Answer: A
---
11.
The melting point of silicon(IV) oxide is about
A) 500 °C B) 1000 °C C) 1500 °C D) 1710 °C
Answer: D (approximately 1710–1730 °C)
---
12.
Fused silica is used in making
A) Cement
B) Laboratory apparatus
C) Bricks
D) Paint
Answer: B
---
13.
Very pure silicon (99%+) is manufactured by heating sand with excess carbon in an electric furnace. The reaction is
A) SiO₂ + 2C → Si + 2CO
B) SiO₂ + C → Si + CO₂
C) SiO₂ + 2Mg → Si + 2MgO
D) SiO₂ + 4HCl → SiCl₄ + 2H₂O
Answer: A
---
14.
Amorphous silicon is prepared by
A) Heating sand with magnesium
B) Heating SiCl₄ with zinc
C) Burning silicon in oxygen
D) Reducing SiO₂ with aluminium
Answer: A
---
15.
Silicon does NOT exhibit the phenomenon of
A) Allotropy
B) Catenation
C) Multiple bonding
D) All of these
Answer: C
---
16.
Silicon is ___ reactive than carbon.
A) Less B) More C) Equally D) Not comparable
Answer: A
---
17.
When strongly heated in air, silicon forms
A) SiC B) Si₃N₄ C) SiO₂ D) SiH₄
Answer: C
---
18.
Silicon decomposes steam at red heat to liberate
A) Oxygen B) Hydrogen C) Carbon dioxide D) Nitrogen
Answer: B
---
19.
Silicon combines with chlorine under similar conditions to form
A) SiCl₄ B) SiH₄ C) SiO₂ D) SiC
Answer: A
---
20.
Graphite does NOT react with chlorine, but silicon does because
A) Silicon is larger in size
B) Silicon has vacant d-orbitals
C) Silicon is more metallic
D) Silicon has lower ionization energy
Answer: B
---
21.
Silicon is used in making semiconductors because
A) It is cheap
B) It can be very pure
C) It has variable valency
D) All of these
Answer: D
---
22.
Silicon is used in bronze and steel alloys to increase
A) Tensile strength
B) Ductility
C) Colour
D) Density
Answer: A
---
23.
Silicons (silicones) are
A) Rubber-like liquids or solids
B) Water and chemically unreactive
C) Used as lubricants, water repellents, insulators
D) All of these
Answer: D
---
24.
Silicon carbide (carborundum) is prepared by heating silica with carbon. Its formula is
A) SiC B) Si₂C C) SiC₂ D) Si₃C
Answer: A
---
25.
Silicon carbide is used as
A) Abrasive B) Lubricant C) Fertilizer D) Pigment
Answer: A
---
26.
Water-glass is a
A) Colloidal solution of silica
B) Viscous liquid of sodium silicate
C) Solid glass
D) Hydrated silica
Answer: B
---
27.
Water-glass is used for
A) Preserving eggs
B) Fire-proofing wood and textiles
C) Making silica garden
D) All of these
Answer: D
---
28.
Kieselguhr is
A) Pure silica
B) Porous and absorbent form of silica
C) Crystalline silica
D) Amorphous carbon
Answer: B
---
29.
❤1
Powdered quartz is used in making
A) Silicon carbide
B) Silicon tetrachloride
C) Sodium trioxosilicate(IV)
D) All of these
Answer: D
---
30.
Trioxosilicates(IV) are salts of
A) H₂SiO₃
B) H₄SiO₄
C) H₂SiO₄
D) HSiO₃
Answer: A
A) Silicon carbide
B) Silicon tetrachloride
C) Sodium trioxosilicate(IV)
D) All of these
Answer: D
---
30.
Trioxosilicates(IV) are salts of
A) H₂SiO₃
B) H₄SiO₄
C) H₂SiO₄
D) HSiO₃
Answer: A
*CONTINUETION*
31.
The most common trioxosilicates(IV) in Earth’s crust are those of
A) Sodium and potassium
B) Calcium and magnesium
C) Iron and aluminium
D) All of these
Answer: D
---
32.
Ordinary glass is also called
A) Flint glass
B) Pyrex glass
C) Lime-soda glass
D) Quartz glass
Answer: C
---
33.
Lime-soda glass is made from a mixture of
A) SiO₂ + Na₂CO₃ + CaCO₃
B) SiO₂ + B₂O₃ + Al₂O₃
C) SiO₂ + PbO
D) Pure SiO₂
Answer: A
---
34.
The reaction for making lime-soda glass is
A) Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂
B) CaCO₃ + SiO₂ → CaSiO₃ + CO₂
C) Both A and B
D) None
Answer: C
---
35.
Ordinary glass softens at about
A) 500 °C B) 800 °C C) 1200 °C D) 1500 °C
Answer: B
---
36.
Glass does not have a sharp melting point because
A) It is amorphous
B) It is crystalline
C) It is a metal
D) It is ionic
Answer: A
---
37.
Flint glass contains
A) Lead silicate
B) Boron oxide
C) Aluminium oxide
D) Pure silica
Answer: A
---
38.
Flint glass is used for making
A) Laboratory apparatus
B) Prisms and lenses
C) Ovenware
D) Optical fibres
Answer: B
---
39.
Pyrex glass contains about
A) 80% SiO₂, 12% B₂O₃
B) 100% SiO₂
C) 50% SiO₂, 50% PbO
D) 70% SiO₂, 30% Na₂O
Answer: A
---
40.
Pyrex glass is an example of
A) Heat-resistant glass
B) Coloured glass
C) Soft glass
D) Flint glass
Answer: A
---
41.
Coloured glass is obtained by adding small quantities of
A) Metallic oxides
B) Carbon
C) Sulphur
D) Chlorine
Answer: A
---
42.
Clay is formed by the weathering of
A) Carbonates
B) Silicate rocks
C) Sulphides
D) Oxides
Answer: B
---
43.
The purest form of clay is
A) Kaolin
B) Bentonite
C) Fire clay
D) Fuller's earth
Answer: A
---
44.
Clay is used in making
A) Pottery and ceramics
B) Tiles and bricks
C) Cement
D) All of these
Answer: D
---
45.
Zeolites are
A) Aluminosilicates
B) Used as water softeners
C) Used in ion-exchange
D) All of these
Answer: D
---
46.
Sodium aluminium trioxosilicate(IV) is used as
A) Water softener
B) Detergent builder
C) Resin in ion-exchange
D) All of these
Answer: D
---
47.
Silicon(IV) oxide reacts with concentrated NaOH to form
A) Na₄SiO₄ + H₂O
B) Na₂SiO₃ + H₂O
C) Na₂SiO₄ + H₂
D) NaSiO₃ + H₂O
Answer: B
---
48.
Silicon carbide is also known as
A) Carborundum
B) Silica gel
C) Quartz
D) Kieselguhr
Answer: A
---
49.
Silicon does not show positive oxidation state higher than
A) +2 B) +4 C) +6 D) +8
Answer: B
---
50.
Silicon forms a macromolecular compound with oxygen atoms linked tetrahedrally in
A) Quartz
B) Tridymite
C) Cristobalite
D) All of these
Answer: D
---
51.
Silicon(IV) oxide is an acidic oxide because
A) It reacts with bases
B) It has high melting point
C) It is insoluble in water
D) It is white
Answer: A
---
52.
Silicon(IV) oxide reacts with hot concentrated KOH to form
A) K₂SiO₃ + H₂O
B) K₄SiO₄ + H₂O
C) K₂SiO₄ + H₂
D) KSiO₃ + H₂O
Answer: A
---
53.
When silica gel is heated strongly, it forms
A) Glass-like solid
B) Water
C) Silicone
D) Silicon carbide
Answer: A
---
54.
Kieselguhr absorbs liquids readily and is used as
A) Absorbent for nitroglycerine (dynamite)
B) Filter
C) Drying agent
D) All of these
Answer: D
---
55.
The structure of silicon(IV) oxide is
A) Chain
B) Layer
C) Three-dimensional network
D) Discrete molecules
Answer: C
---
56.
Silicones are polymers of
A) R₂SiO units
B) RSiO units
C) SiO₂ units
D) R₄Si units
Answer: A
---
57.
Silicones are chemically
A) Inert
B) Water repellent
C) Heat resistant
D) All of these
Answer: D
---
58.
The reaction SiO₂ + 2C → Si + 2CO is carried out in
A) Blast furnace
B) Electric furnace
C) Reverberatory furnace
D) Open hearth furnace
Answer: B
---
59.
Silicon is used for making
A) Transistors
B) Solar cells
C) Integrated circuits
D) All of these
Answer: D
---
60.
Silicon is a
A) Metal
B) Non-metal
C) Metalloid
D) Noble gas
Answer: C
31.
The most common trioxosilicates(IV) in Earth’s crust are those of
A) Sodium and potassium
B) Calcium and magnesium
C) Iron and aluminium
D) All of these
Answer: D
---
32.
Ordinary glass is also called
A) Flint glass
B) Pyrex glass
C) Lime-soda glass
D) Quartz glass
Answer: C
---
33.
Lime-soda glass is made from a mixture of
A) SiO₂ + Na₂CO₃ + CaCO₃
B) SiO₂ + B₂O₃ + Al₂O₃
C) SiO₂ + PbO
D) Pure SiO₂
Answer: A
---
34.
The reaction for making lime-soda glass is
A) Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂
B) CaCO₃ + SiO₂ → CaSiO₃ + CO₂
C) Both A and B
D) None
Answer: C
---
35.
Ordinary glass softens at about
A) 500 °C B) 800 °C C) 1200 °C D) 1500 °C
Answer: B
---
36.
Glass does not have a sharp melting point because
A) It is amorphous
B) It is crystalline
C) It is a metal
D) It is ionic
Answer: A
---
37.
Flint glass contains
A) Lead silicate
B) Boron oxide
C) Aluminium oxide
D) Pure silica
Answer: A
---
38.
Flint glass is used for making
A) Laboratory apparatus
B) Prisms and lenses
C) Ovenware
D) Optical fibres
Answer: B
---
39.
Pyrex glass contains about
A) 80% SiO₂, 12% B₂O₃
B) 100% SiO₂
C) 50% SiO₂, 50% PbO
D) 70% SiO₂, 30% Na₂O
Answer: A
---
40.
Pyrex glass is an example of
A) Heat-resistant glass
B) Coloured glass
C) Soft glass
D) Flint glass
Answer: A
---
41.
Coloured glass is obtained by adding small quantities of
A) Metallic oxides
B) Carbon
C) Sulphur
D) Chlorine
Answer: A
---
42.
Clay is formed by the weathering of
A) Carbonates
B) Silicate rocks
C) Sulphides
D) Oxides
Answer: B
---
43.
The purest form of clay is
A) Kaolin
B) Bentonite
C) Fire clay
D) Fuller's earth
Answer: A
---
44.
Clay is used in making
A) Pottery and ceramics
B) Tiles and bricks
C) Cement
D) All of these
Answer: D
---
45.
Zeolites are
A) Aluminosilicates
B) Used as water softeners
C) Used in ion-exchange
D) All of these
Answer: D
---
46.
Sodium aluminium trioxosilicate(IV) is used as
A) Water softener
B) Detergent builder
C) Resin in ion-exchange
D) All of these
Answer: D
---
47.
Silicon(IV) oxide reacts with concentrated NaOH to form
A) Na₄SiO₄ + H₂O
B) Na₂SiO₃ + H₂O
C) Na₂SiO₄ + H₂
D) NaSiO₃ + H₂O
Answer: B
---
48.
Silicon carbide is also known as
A) Carborundum
B) Silica gel
C) Quartz
D) Kieselguhr
Answer: A
---
49.
Silicon does not show positive oxidation state higher than
A) +2 B) +4 C) +6 D) +8
Answer: B
---
50.
Silicon forms a macromolecular compound with oxygen atoms linked tetrahedrally in
A) Quartz
B) Tridymite
C) Cristobalite
D) All of these
Answer: D
---
51.
Silicon(IV) oxide is an acidic oxide because
A) It reacts with bases
B) It has high melting point
C) It is insoluble in water
D) It is white
Answer: A
---
52.
Silicon(IV) oxide reacts with hot concentrated KOH to form
A) K₂SiO₃ + H₂O
B) K₄SiO₄ + H₂O
C) K₂SiO₄ + H₂
D) KSiO₃ + H₂O
Answer: A
---
53.
When silica gel is heated strongly, it forms
A) Glass-like solid
B) Water
C) Silicone
D) Silicon carbide
Answer: A
---
54.
Kieselguhr absorbs liquids readily and is used as
A) Absorbent for nitroglycerine (dynamite)
B) Filter
C) Drying agent
D) All of these
Answer: D
---
55.
The structure of silicon(IV) oxide is
A) Chain
B) Layer
C) Three-dimensional network
D) Discrete molecules
Answer: C
---
56.
Silicones are polymers of
A) R₂SiO units
B) RSiO units
C) SiO₂ units
D) R₄Si units
Answer: A
---
57.
Silicones are chemically
A) Inert
B) Water repellent
C) Heat resistant
D) All of these
Answer: D
---
58.
The reaction SiO₂ + 2C → Si + 2CO is carried out in
A) Blast furnace
B) Electric furnace
C) Reverberatory furnace
D) Open hearth furnace
Answer: B
---
59.
Silicon is used for making
A) Transistors
B) Solar cells
C) Integrated circuits
D) All of these
Answer: D
---
60.
Silicon is a
A) Metal
B) Non-metal
C) Metalloid
D) Noble gas
Answer: C
61.
The formula of water-glass is
A) Na₂SiO₃
B) Na₄SiO₄
C) Na₂SiO₄
D) Na₂Si₂O₅
Answer: A
---
62.
Sodium trioxosilicate(IV) is obtained by fusing
A) Sand + Na₂CO₃
B) Sand + NaOH
C) Sand + NaCl
D) Sand + Na₂SO₄
Answer: A
---
63.
Water-glass forms a viscous liquid in hot water under pressure and is used as
A) Adhesive
B) Fire-proofing agent
C) Egg preservative
D) All of these
Answer: D
---
64.
On acidification, water-glass sets into a gel known as
A) Silica gel
B) Silicone gel
C) Boron gel
D) Alum gel
Answer: A
---
65.
Silica gel is a good absorbent for
A) Water vapour
B) Valuable vapours in industry
C) Petrol refining
D) All of these
Answer: D
---
66.
The purest form of clay used for making porcelain is
A) Kaolin
B) Bentonite
C) Fire clay
D) Ball clay
Answer: A
---
67.
Cement is made by heating clay with
A) Limestone
B) Sand
C) Gypsum
D) Coke
Answer: A
---
68.
Glass is regarded as a super-cooled liquid because
A) It is amorphous
B) Molecules are randomly arranged
C) It flows very slowly
D) All of these
Answer: D
---
69.
The softening of glass before melting is an important property because
A) It allows shaping
B) Prevents cracking
C) Both A and B
D) None
Answer: C
---
70.
Heat-resistant glass (Pyrex) has a low coefficient of expansion due to
A) High silica and boron content
B) Lead oxide
C) Sodium oxide
D) Calcium oxide
Answer: A
---
71.
Quartz crystals are used for
A) Optical instruments
B) Frequency control in radio transmitters
C) Ultraviolet lamps
D) All of these
Answer: D
---
72.
Silicon tetrachloride is prepared by
A) Direct combination of Si and Cl₂
B) Action of HCl on SiO₂
C) Both A and B
D) None
Answer: C
---
73.
Silicon tetrachloride reacts with water to form
A) Silica and HCl
B) Silicic acid and HCl
C) Both A and B
D) Only silica
Answer: C
---
74.
Silicon is more reactive than graphite because
A) It has vacant d-orbitals
B) It is larger in size
C) Lower ionization energy
D) All of these
Answer: A
---
75.
Silicon does not form multiple bonds easily because
A) d-orbitals are not suitable for effective π-overlap
B) It is too small
C) High electronegativity
D) Metallic nature
Answer: A
---
76.
Silicon reacts with hot concentrated alkali as
A) Si + 2NaOH + H₂O → Na₂SiO₃ + 2H₂
B) No reaction
C) Forms silicate only
D) Forms oxide
Answer: A
---
77.
Silicon(IV) oxide is insoluble in water due to
A) Giant covalent network
B) Strong Si–O bonds
C) High lattice energy
D) All of these
Answer: D
---
78.
Fused quartz is transparent to
A) Ultraviolet light
B) Infrared light
C) Visible light
D) All of these
Answer: D (especially UV)
---
79.
Kieselguhr is used in making
A) Dynamite
B) Filters
C) Polishing powders
D) All of these
Answer: D
---
80.
The formula of sodium trioxosilicate(IV) is
A) Na₂SiO₃
B) Na₄SiO₄
C) Na₂SiO₄
D) NaSiO₃
Answer: A
---
81.
Flint glass has high refractive index due to
A) Lead oxide
B) Boron oxide
C) Aluminium oxide
D) Calcium oxide
Answer: A
---
82.
Pyrex glass contains approximately
A) 80% SiO₂, 12% B₂O₃, small Al₂O₃ and Na₂O
B) 100% SiO₂
C) 60% SiO₂, 40% PbO
D) 50% SiO₂, 50% Na₂O
Answer: A
---
83.
Coloured glass is produced by adding
A) Metallic oxides
B) Carbon
C) Sulphur
D) Chlorine
Answer: A
---
84.
Clay is mainly
A) Hydrated aluminium trioxosilicate(IV)
B) Pure silica
C) Calcium silicate
D) Sodium silicate
Answer: A
---
85.
Zeolites are used as
A) Water softeners
B) Molecular sieves
C) Ion-exchangers
D) All of these
Answer: D
---
86.
Silicon carbide is also called
A) Carborundum
B) Moissanite
C) Both A and B
D) Silica
Answer: C
---
87.
Silicon carbide is
A) Very hard
B) Used as abrasive
C) High melting point
D) All of these
Answer: D
---
88.
Silicones are
A) Polymers of R₂SiO units
B) Water repellent
C) Heat resistant
D) All of these
Answer: D
---
89.
Very pure silicon is manufactured by
A) Zone refining
B) Heating SiCl₄ with Zn or H₂
C) Both A and B
D) Direct carbon reduction
Answer: C
---
90.
Silicon is a
A) Metal
B) Non-metal
C) Metalloid
D) Inert gas
Answer: C
---
91.
The formula of water-glass is
A) Na₂SiO₃
B) Na₄SiO₄
C) Na₂SiO₄
D) Na₂Si₂O₅
Answer: A
---
62.
Sodium trioxosilicate(IV) is obtained by fusing
A) Sand + Na₂CO₃
B) Sand + NaOH
C) Sand + NaCl
D) Sand + Na₂SO₄
Answer: A
---
63.
Water-glass forms a viscous liquid in hot water under pressure and is used as
A) Adhesive
B) Fire-proofing agent
C) Egg preservative
D) All of these
Answer: D
---
64.
On acidification, water-glass sets into a gel known as
A) Silica gel
B) Silicone gel
C) Boron gel
D) Alum gel
Answer: A
---
65.
Silica gel is a good absorbent for
A) Water vapour
B) Valuable vapours in industry
C) Petrol refining
D) All of these
Answer: D
---
66.
The purest form of clay used for making porcelain is
A) Kaolin
B) Bentonite
C) Fire clay
D) Ball clay
Answer: A
---
67.
Cement is made by heating clay with
A) Limestone
B) Sand
C) Gypsum
D) Coke
Answer: A
---
68.
Glass is regarded as a super-cooled liquid because
A) It is amorphous
B) Molecules are randomly arranged
C) It flows very slowly
D) All of these
Answer: D
---
69.
The softening of glass before melting is an important property because
A) It allows shaping
B) Prevents cracking
C) Both A and B
D) None
Answer: C
---
70.
Heat-resistant glass (Pyrex) has a low coefficient of expansion due to
A) High silica and boron content
B) Lead oxide
C) Sodium oxide
D) Calcium oxide
Answer: A
---
71.
Quartz crystals are used for
A) Optical instruments
B) Frequency control in radio transmitters
C) Ultraviolet lamps
D) All of these
Answer: D
---
72.
Silicon tetrachloride is prepared by
A) Direct combination of Si and Cl₂
B) Action of HCl on SiO₂
C) Both A and B
D) None
Answer: C
---
73.
Silicon tetrachloride reacts with water to form
A) Silica and HCl
B) Silicic acid and HCl
C) Both A and B
D) Only silica
Answer: C
---
74.
Silicon is more reactive than graphite because
A) It has vacant d-orbitals
B) It is larger in size
C) Lower ionization energy
D) All of these
Answer: A
---
75.
Silicon does not form multiple bonds easily because
A) d-orbitals are not suitable for effective π-overlap
B) It is too small
C) High electronegativity
D) Metallic nature
Answer: A
---
76.
Silicon reacts with hot concentrated alkali as
A) Si + 2NaOH + H₂O → Na₂SiO₃ + 2H₂
B) No reaction
C) Forms silicate only
D) Forms oxide
Answer: A
---
77.
Silicon(IV) oxide is insoluble in water due to
A) Giant covalent network
B) Strong Si–O bonds
C) High lattice energy
D) All of these
Answer: D
---
78.
Fused quartz is transparent to
A) Ultraviolet light
B) Infrared light
C) Visible light
D) All of these
Answer: D (especially UV)
---
79.
Kieselguhr is used in making
A) Dynamite
B) Filters
C) Polishing powders
D) All of these
Answer: D
---
80.
The formula of sodium trioxosilicate(IV) is
A) Na₂SiO₃
B) Na₄SiO₄
C) Na₂SiO₄
D) NaSiO₃
Answer: A
---
81.
Flint glass has high refractive index due to
A) Lead oxide
B) Boron oxide
C) Aluminium oxide
D) Calcium oxide
Answer: A
---
82.
Pyrex glass contains approximately
A) 80% SiO₂, 12% B₂O₃, small Al₂O₃ and Na₂O
B) 100% SiO₂
C) 60% SiO₂, 40% PbO
D) 50% SiO₂, 50% Na₂O
Answer: A
---
83.
Coloured glass is produced by adding
A) Metallic oxides
B) Carbon
C) Sulphur
D) Chlorine
Answer: A
---
84.
Clay is mainly
A) Hydrated aluminium trioxosilicate(IV)
B) Pure silica
C) Calcium silicate
D) Sodium silicate
Answer: A
---
85.
Zeolites are used as
A) Water softeners
B) Molecular sieves
C) Ion-exchangers
D) All of these
Answer: D
---
86.
Silicon carbide is also called
A) Carborundum
B) Moissanite
C) Both A and B
D) Silica
Answer: C
---
87.
Silicon carbide is
A) Very hard
B) Used as abrasive
C) High melting point
D) All of these
Answer: D
---
88.
Silicones are
A) Polymers of R₂SiO units
B) Water repellent
C) Heat resistant
D) All of these
Answer: D
---
89.
Very pure silicon is manufactured by
A) Zone refining
B) Heating SiCl₄ with Zn or H₂
C) Both A and B
D) Direct carbon reduction
Answer: C
---
90.
Silicon is a
A) Metal
B) Non-metal
C) Metalloid
D) Inert gas
Answer: C
---
91.
Silicon does not occur free in nature but as
A) SiO₂ and silicates
B) Silicon carbide
C) Silicon nitride
D) All of these
Answer: A
---
92.
The reaction SiO₂ + 3C → SiC + 2CO produces
A) Silicon
B) Silicon carbide
C) Silicon nitride
D) Silane
Answer: B
---
93.
Silica gel packets say “Do not eat” because they are
A) Poisonous
B) Hygroscopic
C) Radioactive
D) Explosive
Answer: B
---
94.
Graphite does not react with chlorine but silicon does because
A) Silicon has vacant d-orbitals
B) Silicon is smaller
C) Graphite is more stable
D) Chlorine is inert
Answer: A
---
95.
Silicon forms
A) Silicides with metals
B) Silicates with metal oxides
C) Both A and B
D) None
Answer: C
---
96.
The structure of quartz is
A) Three-dimensional network
B) Layer structure
C) Chain structure
D) Discrete molecules
Answer: A
---
97.
Ordinary glass is softened and shaped by
A) Blowing
B) Pressing
C) Both A and B
D) Only melting
Answer: C
---
98.
Annealing of glass is done to
A) Remove internal stress
B) Cool slowly and uniformly
C) Prevent cracking
D) All of these
Answer: D
---
99.
Lime-soda glass cracks easily on sudden temperature change because
A) High coefficient of expansion
B) Low silica content
C) Presence of sodium
D) All of these
Answer: A
---
100.
The reaction
2KOH(aq) + SiO₂(s) → K₂SiO₃(aq) + H₂O(l)
shows that silica is
A) Acidic oxide
B) Basic oxide
C) Amphoteric
D) Neutral
Answer: A
A) SiO₂ and silicates
B) Silicon carbide
C) Silicon nitride
D) All of these
Answer: A
---
92.
The reaction SiO₂ + 3C → SiC + 2CO produces
A) Silicon
B) Silicon carbide
C) Silicon nitride
D) Silane
Answer: B
---
93.
Silica gel packets say “Do not eat” because they are
A) Poisonous
B) Hygroscopic
C) Radioactive
D) Explosive
Answer: B
---
94.
Graphite does not react with chlorine but silicon does because
A) Silicon has vacant d-orbitals
B) Silicon is smaller
C) Graphite is more stable
D) Chlorine is inert
Answer: A
---
95.
Silicon forms
A) Silicides with metals
B) Silicates with metal oxides
C) Both A and B
D) None
Answer: C
---
96.
The structure of quartz is
A) Three-dimensional network
B) Layer structure
C) Chain structure
D) Discrete molecules
Answer: A
---
97.
Ordinary glass is softened and shaped by
A) Blowing
B) Pressing
C) Both A and B
D) Only melting
Answer: C
---
98.
Annealing of glass is done to
A) Remove internal stress
B) Cool slowly and uniformly
C) Prevent cracking
D) All of these
Answer: D
---
99.
Lime-soda glass cracks easily on sudden temperature change because
A) High coefficient of expansion
B) Low silica content
C) Presence of sodium
D) All of these
Answer: A
---
100.
The reaction
2KOH(aq) + SiO₂(s) → K₂SiO₃(aq) + H₂O(l)
shows that silica is
A) Acidic oxide
B) Basic oxide
C) Amphoteric
D) Neutral
Answer: A
❤1
101.
Silicon(IV) oxide reacts with Na₂CO₃ on strong heating to form
A) Na₄SiO₄ + CO₂
B) Na₂SiO₃ + CO₂
C) Na₂SiO₄ + CO₂
D) NaSiO₃ + CO₂
Answer: B
---
102.
The compound commonly known as “silica” is
A) SiO
B) SiO₂
C) Si₂O₃
D) Si₃O₄
Answer: B
---
103.
Which form of silica has a very low coefficient of expansion?
A) Quartz
B) Fused silica
C) Tridymite
D) Cristobalite
Answer: B
---
104.
Silica gel is represented as
A) SiO₂·nH₂O
B) SiO₂ only
C) Na₂SiO₃·nH₂O
D) Al₂SiO₅
Answer: A
---
105.
The main use of silica gel in industry is as a
A) Dehydrating agent
B) Catalyst
C) Adsorbent for gases/vapours
D) All of these
Answer: D
---
106.
Which is NOT a natural form of silica?
A) Quartz
B) Flint
C) Opal
D) Silica gel
Answer: D
---
107.
Silicon carbide (SiC) is also called
A) Carborundum
B) Moissanite
C) Both A and B
D) Corundum
Answer: C
---
108.
The reaction
SiO₂ + 3C → SiC + 2CO
takes place at
A) 500 °C
B) 1000 °C
C) Very high temperature
D) Room temperature
Answer: C
---
109.
Water-glass on strong heating with sodium hexafluorosilicate(IV) gives
A) Silica gel
B) Glass
C) Sodium fluoride
D) Silicon carbide
Answer: A
---
110.
Which glass is used for making chemical laboratory apparatus?
A) Soda-lime glass
B) Flint glass
C) Borosilicate (Pyrex) glass
D) Lead crystal glass
Answer: C
---
111.
The approximate composition of Pyrex glass is
A) SiO₂ 80%, B₂O₃ 12%, Al₂O₃ + Na₂O rest
B) SiO₂ 100%
C) SiO₂ 60%, PbO 30%
D) SiO₂ 55%, Na₂O 30%
Answer: A
---
112.
Flint glass is heavy and brilliant because it contains
A) Lead oxide
B) Boron oxide
C) Aluminium oxide
D) Iron oxide
Answer: A
---
113.
The softening point of ordinary soda-lime glass is around
A) 300–400 °C
B) 600–800 °C
C) 1000 °C
D) 1500 °C
Answer: B
---
114.
Glass turns into a super-cooled liquid because
A) It has no sharp melting point
B) It is amorphous
C) Molecules are randomly arranged
D) All of these
Answer: D
---
115.
Which type of glass is used for making prisms and achromatic lenses?
A) Soda-lime
B) Pyrex
C) Flint
D) Quartz
Answer: C
---
116.
Coloured glasses are obtained by adding small amounts of
A) Transition metal oxides
B) Alkali metals
C) Carbon
D) Sulphur
Answer: A
---
117.
The purest form of clay used for porcelain is
A) Fire clay
B) Ball clay
C) Kaolin (China clay)
D) Bentonite
Answer: C
---
118.
Cement is manufactured by strongly heating a mixture of
A) Clay + limestone
B) Sand + limestone
C) Clay + gypsum
D) Clay + coke
Answer: A
---
119.
Zeolites are basically
A) Hydrated sodium aluminosilicates
B) Anhydrous calcium silicates
C) Pure silica
D) Silicon carbide
Answer: A
---
120.
Zeolites are widely used as
A) Water softeners
B) Molecular sieves
C) Ion-exchange resins
D) All of these
Answer: D
---
121 – 135
---
121.
Which of the following is an acidic oxide?
A) Na₂O
B) CO₂
C) SiO₂
D) CaO
Answer: C
---
122.
Silicon(IV) oxide reacts with HF to form
A) SiF₄
B) H₂SiF₆
C) SiCl₄
D) SiH₄
Answer: B
---
123.
Silicon does not react with dilute acids but reacts with
A) Hot concentrated NaOH
B) Cold dilute NaOH
C) HCl
D) HNO₃
Answer: A
---
124.
The gas evolved when silicon reacts with hot concentrated NaOH is
A) O₂
B) H₂
C) CO₂
D) N₂
Answer: B
---
125.
Very pure silicon for semiconductors is obtained by
A) Zone refining
B) Reduction with carbon
C) Heating with Mg
D) Direct fusion
Answer: A
---
126.
Silicon is used in
A) Steel alloys
B) Bronze
C) Solar cells
D) All of these
Answer: D
---
127.
Which is NOT a use of silicones?
A) Lubricants
B) Water repellents
C) Electrical insulators
D) Abrasives
Answer: D
---
128.
Silicon shows a valency of
A) 2 only
B) 4 only
C) 2 and 4
D) 6
Answer: B
---
129.
The structure of silicones is
A) –Si–O–Si–O– chain with organic groups
B) Pure SiO₂ network
C) Si–Si chains
D) Ring structure
Answer: A
---
130.
Silica is used in the lining of furnaces because it is
A) Heat resistant
B) Acid resistant
C) Both A and B
D) Cheap
Answer: C
---
131.
Silicon(IV) oxide reacts with Na₂CO₃ on strong heating to form
A) Na₄SiO₄ + CO₂
B) Na₂SiO₃ + CO₂
C) Na₂SiO₄ + CO₂
D) NaSiO₃ + CO₂
Answer: B
---
102.
The compound commonly known as “silica” is
A) SiO
B) SiO₂
C) Si₂O₃
D) Si₃O₄
Answer: B
---
103.
Which form of silica has a very low coefficient of expansion?
A) Quartz
B) Fused silica
C) Tridymite
D) Cristobalite
Answer: B
---
104.
Silica gel is represented as
A) SiO₂·nH₂O
B) SiO₂ only
C) Na₂SiO₃·nH₂O
D) Al₂SiO₅
Answer: A
---
105.
The main use of silica gel in industry is as a
A) Dehydrating agent
B) Catalyst
C) Adsorbent for gases/vapours
D) All of these
Answer: D
---
106.
Which is NOT a natural form of silica?
A) Quartz
B) Flint
C) Opal
D) Silica gel
Answer: D
---
107.
Silicon carbide (SiC) is also called
A) Carborundum
B) Moissanite
C) Both A and B
D) Corundum
Answer: C
---
108.
The reaction
SiO₂ + 3C → SiC + 2CO
takes place at
A) 500 °C
B) 1000 °C
C) Very high temperature
D) Room temperature
Answer: C
---
109.
Water-glass on strong heating with sodium hexafluorosilicate(IV) gives
A) Silica gel
B) Glass
C) Sodium fluoride
D) Silicon carbide
Answer: A
---
110.
Which glass is used for making chemical laboratory apparatus?
A) Soda-lime glass
B) Flint glass
C) Borosilicate (Pyrex) glass
D) Lead crystal glass
Answer: C
---
111.
The approximate composition of Pyrex glass is
A) SiO₂ 80%, B₂O₃ 12%, Al₂O₃ + Na₂O rest
B) SiO₂ 100%
C) SiO₂ 60%, PbO 30%
D) SiO₂ 55%, Na₂O 30%
Answer: A
---
112.
Flint glass is heavy and brilliant because it contains
A) Lead oxide
B) Boron oxide
C) Aluminium oxide
D) Iron oxide
Answer: A
---
113.
The softening point of ordinary soda-lime glass is around
A) 300–400 °C
B) 600–800 °C
C) 1000 °C
D) 1500 °C
Answer: B
---
114.
Glass turns into a super-cooled liquid because
A) It has no sharp melting point
B) It is amorphous
C) Molecules are randomly arranged
D) All of these
Answer: D
---
115.
Which type of glass is used for making prisms and achromatic lenses?
A) Soda-lime
B) Pyrex
C) Flint
D) Quartz
Answer: C
---
116.
Coloured glasses are obtained by adding small amounts of
A) Transition metal oxides
B) Alkali metals
C) Carbon
D) Sulphur
Answer: A
---
117.
The purest form of clay used for porcelain is
A) Fire clay
B) Ball clay
C) Kaolin (China clay)
D) Bentonite
Answer: C
---
118.
Cement is manufactured by strongly heating a mixture of
A) Clay + limestone
B) Sand + limestone
C) Clay + gypsum
D) Clay + coke
Answer: A
---
119.
Zeolites are basically
A) Hydrated sodium aluminosilicates
B) Anhydrous calcium silicates
C) Pure silica
D) Silicon carbide
Answer: A
---
120.
Zeolites are widely used as
A) Water softeners
B) Molecular sieves
C) Ion-exchange resins
D) All of these
Answer: D
---
121 – 135
---
121.
Which of the following is an acidic oxide?
A) Na₂O
B) CO₂
C) SiO₂
D) CaO
Answer: C
---
122.
Silicon(IV) oxide reacts with HF to form
A) SiF₄
B) H₂SiF₆
C) SiCl₄
D) SiH₄
Answer: B
---
123.
Silicon does not react with dilute acids but reacts with
A) Hot concentrated NaOH
B) Cold dilute NaOH
C) HCl
D) HNO₃
Answer: A
---
124.
The gas evolved when silicon reacts with hot concentrated NaOH is
A) O₂
B) H₂
C) CO₂
D) N₂
Answer: B
---
125.
Very pure silicon for semiconductors is obtained by
A) Zone refining
B) Reduction with carbon
C) Heating with Mg
D) Direct fusion
Answer: A
---
126.
Silicon is used in
A) Steel alloys
B) Bronze
C) Solar cells
D) All of these
Answer: D
---
127.
Which is NOT a use of silicones?
A) Lubricants
B) Water repellents
C) Electrical insulators
D) Abrasives
Answer: D
---
128.
Silicon shows a valency of
A) 2 only
B) 4 only
C) 2 and 4
D) 6
Answer: B
---
129.
The structure of silicones is
A) –Si–O–Si–O– chain with organic groups
B) Pure SiO₂ network
C) Si–Si chains
D) Ring structure
Answer: A
---
130.
Silica is used in the lining of furnaces because it is
A) Heat resistant
B) Acid resistant
C) Both A and B
D) Cheap
Answer: C
---
131.
Quartz crystals are piezoelectric. This property is used in
A) Oscillators
B) Radio transmitters
C) Watches
D) All of these
Answer: D
---
132.
Which form of silica is used for making optical fibres?
A) Quartz
B) Fused silica
C) Cristobalite
D) Tridymite
Answer: B
---
133.
Kieselguhr is a
A) Porous diatomaceous earth
B) Crystalline quartz
C) Amorphous carbon
D) Hydrated sodium silicate
Answer: A
---
134.
The main constituent of diatom shells is
A) CaCO₃
B) SiO₂
C) MgCO₃
D) Organic matter
Answer: B
---
135.
The reaction
Si + 2Cl₂ → SiCl₄
shows silicon can act as
A) Oxidising agent
B) Reducing agent
C) Both
D) None
Answer: B
---
136 – 139
---
136.
Silicon tetrachloride is a
A) Liquid that fumes in moist air
B) Solid
C) Gas
D) Non-reactive compound
Answer: A
---
137.
Silicon does NOT form graphite-like structure because
A) It is larger in size
B) It has d-orbitals
C) Both
D) It is more metallic
Answer: C
---
138.
The bond in SiO₂ is
A) 50% ionic, 50% covalent
B) Purely covalent
C) Highly covalent with some ionic character
D) Metallic
Answer: C
---
139.
Which is the hardest known material after diamond?
A) SiC
B) B₄C
C) Both A and B
D) Al₂O₃
Answer: C
A) Oscillators
B) Radio transmitters
C) Watches
D) All of these
Answer: D
---
132.
Which form of silica is used for making optical fibres?
A) Quartz
B) Fused silica
C) Cristobalite
D) Tridymite
Answer: B
---
133.
Kieselguhr is a
A) Porous diatomaceous earth
B) Crystalline quartz
C) Amorphous carbon
D) Hydrated sodium silicate
Answer: A
---
134.
The main constituent of diatom shells is
A) CaCO₃
B) SiO₂
C) MgCO₃
D) Organic matter
Answer: B
---
135.
The reaction
Si + 2Cl₂ → SiCl₄
shows silicon can act as
A) Oxidising agent
B) Reducing agent
C) Both
D) None
Answer: B
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136 – 139
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136.
Silicon tetrachloride is a
A) Liquid that fumes in moist air
B) Solid
C) Gas
D) Non-reactive compound
Answer: A
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137.
Silicon does NOT form graphite-like structure because
A) It is larger in size
B) It has d-orbitals
C) Both
D) It is more metallic
Answer: C
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138.
The bond in SiO₂ is
A) 50% ionic, 50% covalent
B) Purely covalent
C) Highly covalent with some ionic character
D) Metallic
Answer: C
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139.
Which is the hardest known material after diamond?
A) SiC
B) B₄C
C) Both A and B
D) Al₂O₃
Answer: C