Preparing for JAMB Chemistry is easier when you practice past questions. They help you understand the exam format and common topics.
With answers included, you can test yourself, improve speed, and gain confidence for better performance in the exam.
Jamb chemistry past questions and answers
1. Which of the following is the electron configuration of sodium? A. 2,8,1 B. 2,8,2 C. 2,7,1 D. 2,6,2. Answer: A
2. The number of moles in 22.4 dm³ of a gas at STP is A. 2 B. 1 C. 0.5 D. 22.4. Answer: B
3. Which of the following elements has the highest electronegativity? A. Oxygen B. Fluorine C. Chlorine D. Nitrogen. Answer: B
4. The bond formed by sharing of electrons is called A. Ionic bond B. Covalent bond C. Metallic bond D. Hydrogen bond. Answer: B
5. Which of the following is an electrolyte? A. Sugar solution B. Distilled water C. Sodium chloride solution D. Kerosene. Answer: C
6. The oxidation number of oxygen in H₂O is A. +2 B. -2 C. 0 D. +1. Answer: B
7. Which of the following is a strong acid? A. CH₃COOH B. HCl C. NH₃ D. NaOH. Answer: B
8. The process of adding hydrogen to a compound is called A. Oxidation B. Reduction C. Neutralization D. Hydrolysis. Answer: B
9. Which gas is evolved when zinc reacts with dilute acid? A. Oxygen B. Hydrogen C. Nitrogen D. Carbon dioxide. Answer: B
10. The periodic table is arranged based on increasing A. Mass number B. Atomic number C. Density D. Volume. Answer: B
11. Which of the following is amphoteric? A. Na₂O B. Al₂O₃ C. CO₂ D. SO₂. Answer: B
12. The pH of a strong acid is likely to be A. 1 B. 7 C. 9 D. 11. Answer: A
13. Which of the following is a saturated hydrocarbon? A. Ethene B. Ethyne C. Ethane D. Benzene. Answer: C
14. The general formula of alkanes is A. CnH₂n B. CnH₂n+2 C. CnH₂n-2 D. CnHn. Answer: B
15. Which of the following is used as a catalyst in the Haber process? A. Copper B. Iron C. Zinc D. Aluminium. Answer: B
16. The molar mass of CO₂ is A. 28 B. 32 C. 44 D. 16. Answer: C
17. Which of the following is an oxidizing agent? A. Hydrogen B. Oxygen C. Nitrogen D. Carbon. Answer: B
18. The process of breaking down compounds using electricity is called A. Distillation B. Electrolysis C. Filtration D. Evaporation. Answer: B
19. Which of the following is an example of an ester? A. CH₃COOH B. CH₃COOCH₃ C. C₂H₅OH D. CH₄. Answer: B
20. The gas law that relates pressure and volume is A. Charles’ law B. Boyle’s law C. Avogadro’s law D. Dalton’s law. Answer: B
Jamb Chemistry Past Questions and Answers
21. Which of the following metals reacts most vigorously with water? A. Sodium B. Copper C. Iron D. Silver. Answer: A
22. The colour of bromine is A. Colourless B. Red-brown C. Yellow D. Green. Answer: B
23. Which of the following is a halogen? A. Chlorine B. Sodium C. Calcium D. Iron. Answer: A
24. The atomic mass of an element is the sum of A. Protons only B. Electrons only C. Protons and neutrons D. Neutrons only. Answer: C
25. Which of the following is an alcohol? A. CH₃OH B. CH₄ C. C₂H₄ D. C₆H₆. Answer: A
26. The gas used in welding is A. Oxygen B. Acetylene C. Nitrogen D. Carbon dioxide. Answer: B
27. Which of the following is an example of a base? A. HCl B. NaOH C. HNO₃ D. H₂SO₄. Answer: B
28. The boiling point of ethanol is approximately A. 50°C B. 78°C C. 100°C D. 120°C. Answer: B
29. Which of the following is an unsaturated hydrocarbon? A. Ethane B. Propane C. Ethene D. Methane. Answer: C
30. The formula of ammonia is A. NH₃ B. NO₂ C. N₂H₄ D. NH₄. Answer: A
31. Which of the following is a transition metal? A. Sodium B. Iron C. Calcium D. Potassium. Answer: B
32. The number of valence electrons in chlorine is A. 5 B. 6 C. 7 D. 8. Answer: C
33. Which of the following is a weak acid? A. HCl B. H₂SO₄ C. CH₃COOH D. HNO₃. Answer: C
34. The reaction between acid and base is called A. Oxidation B. Reduction C. Neutralization D. Combustion. Answer: C
35. Which of the following is a salt? A. NaCl B. HCl C. NaOH D. NH₃. Answer: A
36. The unit of concentration is A. mol/dm³ B. kg C. m/s D. J. Answer: A
37. Which of the following is used in making soap? A. Acid B. Alkali C. Salt D. Alcohol. Answer: B
38. The process of rusting involves A. Reduction only B. Oxidation only C. Both oxidation and reduction D. No reaction. Answer: C
39. Which of the following is an organic compound? A. CO₂ B. NaCl C. CH₄ D. H₂O. Answer: C
40. The gas that turns limewater milky is A. Oxygen B. Hydrogen C. Carbon dioxide D. Nitrogen. Answer: C
Jamb Chemistry Past Questions and Answers
41. Which of the following is a drying agent? A. Water B. Silica gel C. Salt D. Sugar. Answer: B
42. The chemical formula of sulphuric acid is A. H₂SO₄ B. HCl C. HNO₃ D. H₂CO₃. Answer: A
43. Which of the following is used to test for CO₂? A. Litmus B. Limewater C. Phenolphthalein D. Iodine. Answer: B
44. The main constituent of crude oil is A. Alkanes B. Acids C. Salts D. Metals. Answer: A
45. Which of the following is a polymer? A. Ethene B. Polyethene C. Methane D. Benzene. Answer: B
46. The process of removing impurities from water is called A. Filtration B. Purification C. Distillation D. Sedimentation. Answer: B
47. Which of the following is an oxidizing agent? A. CO B. H₂ C. O₂ D. CH₄. Answer: C
48. The symbol of potassium is A. Po B. Pt C. K D. P. Answer: C
49. Which of the following is a covalent compound? A. NaCl B. H₂O C. KBr D. CaO. Answer: B
50. The number of atoms in CO₂ is A. 2 B. 3 C. 4 D. 5. Answer: B
51. Which of the following is a metal? A. Sulphur B. Oxygen C. Copper D. Nitrogen. Answer: C
52. The gas used in photosynthesis is A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen. Answer: C
53. Which of the following is a base? A. NH₃ B. HCl C. CO₂ D. SO₂. Answer: A
54. The valency of carbon is A. 2 B. 3 C. 4 D. 5. Answer: C
55. Which of the following is an example of neutralization? A. Acid + Base B. Acid + Metal C. Base + Metal D. Acid + Salt. Answer: A
56. The process of heating without air is called A. Combustion B. Pyrolysis C. Oxidation D. Reduction. Answer: B
57. Which of the following is used in making glass? A. Silica B. Sugar C. Oil D. Wood. Answer: A
58. The colour of chlorine gas is A. Greenish-yellow B. Blue C. Red D. Black. Answer: A
59. Which of the following is a non-metal? A. Iron B. Copper C. Sulphur D. Zinc. Answer: C
60. The unit of pressure is A. Pascal B. Joule C. Watt D. Newton. Answer: A
Jamb Chemistry Past Questions and Answers
61. Which of the following is an acid salt? A. NaCl B. NaHSO₄ C. Na₂CO₃ D. KCl. Answer: B
62. The process of crystallization is used for A. Separation B. Purification C. Heating D. Mixing. Answer: B
63. Which of the following is a strong base? A. NH₃ B. NaOH C. H₂O D. CO₂. Answer: B
64. The formula of calcium carbonate is A. CaCO₃ B. CaO C. CaCl₂ D. CaSO₄. Answer: A
65. Which of the following is used in batteries? A. Zinc B. Helium C. Neon D. Argon. Answer: A
66. The reaction of metal with acid produces A. Salt and hydrogen B. Salt and oxygen C. Base and water D. Acid and gas. Answer: A
67. Which of the following is a gas at room temperature? A. Bromine B. Mercury C. Oxygen D. Iodine. Answer: C
68. The chemical name of baking soda is A. Sodium chloride B. Sodium bicarbonate C. Sodium hydroxide D. Sodium sulphate. Answer: B
69. Which of the following is an element? A. Water B. Air C. Gold D. Salt. Answer: C
70. The process of adding oxygen to a substance is called A. Reduction B. Oxidation C. Neutralization D. Combustion. Answer: B