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100 JAMB QUESTIONS ON CHEMISTRY APRIL BATCH 1 AND 2


1. Which of the following is a chemical change?
A. Melting of ice
B. Boiling of water
C. Rusting of iron
D. Breaking of glass
Answer: C

2. What is the oxidation number of sulfur in H₂SO₄?
A. +4
B. +6
C. -2
D. 0
Answer: B

3. Which of the following gases is not a greenhouse gas?
A. CO₂
B. CH₄
C. N₂
D. H₂O vapour
Answer: C

4. Which particle has the same number of protons and electrons but different number of neutrons?
A. Isomer
B. Isotope
C. Ion
D. Molecule
Answer: B

5. What is the molar volume of an ideal gas at STP?
A. 22.4 dm³
B. 24 dm³
C. 1.0 dm³
D. 2.24 dm³
Answer: A

6. Which of the following represents a covalent compound?
A. NaCl
B. MgO
C. H₂O
D. CaCl₂
Answer: C

7. Which of these processes is endothermic?
A. Freezing of water
B. Condensation of steam
C. Dissolution of NH₄Cl in water
D. Combustion of methane
Answer: C

8. What is the pH of a solution with [H⁺] = 1 × 10⁻⁴ mol/dm³?
A. 4
B. 10
C. 7
D. 2
Answer: A

9. What is the IUPAC name of CH₃CH₂OH?
A. Methanol
B. Ethanol
C. Propanol
D. Butanol
Answer: B

10. Which of the following is an alkyne?
A. C₂H₆
B. C₂H₄
C. C₂H₂
D. CH₄
Answer: C

11. What is the main ore of aluminum?
A. Hematite
B. Bauxite
C. Galena
D. Magnetite
Answer: B

12. Which of these elements has the highest electronegativity?
A. Fluorine
B. Oxygen
C. Nitrogen
D. Chlorine
Answer: A

13. What is the formula mass of Na₂CO₃?
A. 106 g/mol
B. 84 g/mol
C. 40 g/mol
D. 23 g/mol
Answer: A

14. What is the oxidation number of Mn in KMnO₄?
A. +2
B. +4
C. +6
D. +7
Answer: D

15. Which of the following is a base?
A. H₂SO₄
B. NaOH
C. HCl
D. CO₂
Answer: B

16. Which of the following shows periodicity?
A. Atomic number
B. Isotopy
C. Mass number
D. Ionization energy
Answer: D

17. Which of the following is not a property of acids?
A. Sour taste
B. Turns blue litmus red
C. Reacts with bases
D. Soapy feel
Answer: D

18. The major constituent of natural gas is:
A. Methane
B. Ethane
C. Butane
D. Propane
Answer: A

19. What is the number of neutrons in ³⁹₁₉K?
A. 20
B. 19
C. 39
D. 58
Answer: A

20. The process of separating liquids with different boiling points is called:
A. Filtration
B. Crystallization
C. Distillation
D. Sublimation
Answer: C

21. What is the shape of the water molecule?

A. Linear
B. Tetrahedral
C. Angular (V-shaped)
D. Trigonal planar
Answer: C

22. Which element forms a basic oxide?
A. CO₂
B. SO₂
C. Na₂O
Did. NO₂
Answer: C

23. The number of unpaired electrons in an oxygen atom is:
A. 0
B. 1
C. 2
D. 4
Answer: C

24. Which of the following has giant covalent structure?
A. NaCl
B. H₂O
C. Diamond
D. CH₄
Answer: C

25. Which of the following gases is monoatomic?
A. O₂
B. N₂
C. Ne
D. Cl₂
Answer: C

26. Which process is used to obtain pure water from salt water?
A. Filtration
B. Decantation
C. Distillation
D. Crystallization
Answer: C

27. Which of these best describes the solubility of gases in water?
A. Increases with temperature
B. Decreases with pressure
C. Increases with pressure
D. Independent of pressure
Answer: C

28. Which of the following undergoes addition reaction?
A. Alkane
B. Alkene
C. Alkyne
D. Aromatic hydrocarbon
Answer: B

29. What is the empirical formula of a compound with 40% C, 6.7% H, and 53.3% O?
A. CHO
B. CH₂O
C. C₂H₄O₂
D. C₆H₁₂O₆
Answer: B

30. The monomer of polyethylene is:
A. Ethene
B. Ethane
C. Propene
D. Methane
Answer: A

31. Which of these metals will not liberate hydrogen from dilute HCl?
A. Zinc
B. Iron
C. Copper
D. Magnesium
Answer: C

32. The device used to measure atmospheric pressure is called:
A. Thermometer
B. Barometer
C. Hygrometer
D. Manometer
Answer: B

33. The compound that decolorizes bromine water is:
A. Ethane
B. Ethene
C. Methane
D. Ethanol
Answer: B

34. What is the major constituent of air by volume?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Argon
Answer: B

35. Which of the following is an amphoteric oxide?
A. Na₂O
B. ZnO
C. CO₂
D. SO₂
Answer: B

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