📢 Today's Quiz Topic
Chemical Reactions and Equations
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Chemical Reactions and Equations
⏰ The quiz will start in 30 seconds! Get ready! 🧠
In the reaction CuO + H₂ → Cu + H₂O, which substance is being reduced?
Anonymous Quiz
55%
CuO
17%
H₂
22%
Cu
6%
H₂O
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When magnesium ribbon is burned in the air, it forms a white powder. What is this white powder?
Anonymous Quiz
12%
Magnesium carbonate
80%
Magnesium oxide
6%
Magnesium hydroxide
2%
Magnesium sulphate
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In the redox reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, identify the oxidizing agent.
Anonymous Quiz
55%
MnO₂
26%
HCl
15%
MnCl₂
4%
Cl₂
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Which of the following statements about a balanced chemical equation is true?
Anonymous Quiz
14%
The number of molecules is conserved.
26%
The number of atoms is conserved.
38%
The physical states of reactants and products are always the same.
22%
The total mass of reactants is greater than the total mass of products.
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Respiration is considered an exothermic process because:
Anonymous Quiz
12%
It absorbs energy from the surroundings.
23%
It involves the breakdown of complex molecules.
62%
Energy is released during the process.
3%
It requires oxygen.
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In the balanced equation: aFe + bH₂O → cFe₃O₄ + dH₂, what are the values of a, b, c, and d respectively?
Anonymous Quiz
15%
2, 3, 1, 3
69%
3, 4, 1, 4
11%
3, 3, 1, 3
6%
1, 2, 3, 4
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When dilute hydrochloric acid is added to zinc granules, which of the following is observed?
Anonymous Quiz
15%
The surface of the metal becomes shiny.
20%
The solution turns green.
17%
A pungent smelling gas is evolved.
48%
Bubbles of a colorless and odorless gas are formed.
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An unbalanced chemical equation is also known as a:
Anonymous Quiz
13%
Molecular equation
13%
Ionic equation
68%
Skeletal chemical equation
6%
Net ionic equation
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A solution of a substance 'X' is used for whitewashing. Identify substance 'X'.
Anonymous Quiz
37%
Calcium carbonate (CaCO₃)
35%
Calcium hydroxide (Ca(OH)₂)
25%
Calcium oxide (CaO)
4%
Calcium sulphate (CaSO₄)
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The reaction between sodium sulphate (Na₂SO₄) and barium chloride (BaCl₂) solutions results in the formation of a white precipitate. This reaction is classified as a:
Anonymous Quiz
7%
Combination reaction
19%
Displacement reaction
10%
Redox reaction
63%
Double displacement reaction
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The process of decomposition of a substance by passing electricity through it is known as:
Anonymous Quiz
11%
Thermolysis
5%
Photolysis
82%
Electrolysis
2%
Hydrolysis
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When lead nitrate (Pb(NO₃)₂) is heated, it decomposes to form lead oxide, nitrogen dioxide, and oxygen. What is the color of the nitrogen dioxide gas evolved?
Anonymous Quiz
29%
Colorless
19%
Green
40%
Brown
12%
Yellow
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What happens when an iron nail is placed in a copper sulphate solution?
Anonymous Quiz
65%
The solution turns green and a brown layer deposits on the nail.
19%
The solution remains blue and a silver layer deposits on the nail.
8%
No reaction occurs.
8%
The solution turns colorless and the nail dissolves.
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Which of the following processes is endothermic in nature?
Anonymous Quiz
31%
Burning of natural gas
12%
Dilution of a strong acid
35%
Decomposition of calcium carbonate
22%
Respiration in human beings
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The reaction CaO(s) + H₂O(l) → Ca(OH)₂(aq) is an example of which type of reaction?
Anonymous Quiz
12%
Decomposition reaction
13%
Displacement reaction
70%
Combination reaction
6%
Double displacement reaction
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Silver articles turn black after some time when exposed to air because they react with:
Anonymous Quiz
44%
Oxygen in the air
11%
Nitrogen in the air
36%
Sulphur compounds in the air
9%
Carbon dioxide in the air
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When aqueous solutions of lead(II) nitrate and potassium iodide are mixed, what is the color of the precipitate formed?
Anonymous Quiz
27%
White
15%
Blue
24%
Brown
34%
Yellow
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Which gas is flushed into packets of chips to prevent rancidity?
Anonymous Quiz
5%
Oxygen
83%
Nitrogen
7%
Hydrogen
4%
Carbon dioxide
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