Post UTME Chemistry past questions and answers are very helpful for students preparing for university entrance exams. They give you a clear idea of how questions are set and the topics that come up most often. By practicing them regularly, you can improve your understanding and become more confident in answering questions correctly.
Chemistry involves both theory and calculations, so constant practice is important. Using past questions helps you revise key topics, manage your time better during exams, and avoid common mistakes. With proper preparation, you can increase your chances of performing well in your Post UTME.
Post Utme Chemistry Past Questions and Answers
1. Which of the following best describes isotopes? A. Atoms with same mass number but different atomic numbers B. Atoms with same atomic number but different mass numbers C. Atoms with different protons and neutrons D. Molecules with same formula. Answer: B
2. The oxidation number of sulphur in H₂SO₄ is A. +2 B. +4 C. +6 D. -2. Answer: C
3. Which of the following compounds exhibits hydrogen bonding? A. CH₄ B. NH₃ C. CO₂ D. HCl. Answer: B
4. The shape of methane molecule is A. Linear B. Trigonal planar C. Tetrahedral D. Bent. Answer: C
5. Which of the following is an example of a buffer solution? A. HCl + NaCl B. CH₃COOH + CH₃COONa C. NaOH + NaCl D. H₂SO₄ + HCl. Answer: B
6. The hybridization in ethene is A. sp B. sp² C. sp³ D. sp³d. Answer: B
7. Which of the following has the highest boiling point? A. CH₄ B. NH₃ C. H₂O D. CO₂. Answer: C
8. The IUPAC name of CH₃CH₂OH is A. Methanol B. Ethanol C. Propanol D. Butanol. Answer: B
9. Which of the following is an example of oxidation? A. Gain of electrons B. Loss of oxygen C. Loss of electrons D. Addition of hydrogen. Answer: C
10. The number of orbitals in the p-subshell is A. 1 B. 2 C. 3 D. 5. Answer: C
11. Which of the following is a strong electrolyte? A. Glucose B. NaCl C. Urea D. Ethanol. Answer: B
12. The bond angle in water molecule is approximately A. 90° B. 104.5° C. 120° D. 180°. Answer: B
13. Which of the following is a secondary alcohol? A. CH₃OH B. CH₃CH(OH)CH₃ C. CH₃CH₂OH D. C₂H₅OH. Answer: B
14. The main ore of aluminium is A. Hematite B. Bauxite C. Galena D. Sphalerite. Answer: B
15. Which of the following is an example of addition reaction? A. Combustion B. Substitution C. Hydrogenation D. Cracking. Answer: C
16. The pH of a basic solution is A. Less than 7 B. Equal to 7 C. Greater than 7 D. Zero. Answer: C
17. Which of the following elements is most reactive? A. Sodium B. Magnesium C. Aluminium D. Iron. Answer: A
18. The process of converting starch to glucose is A. Hydrolysis B. Oxidation C. Reduction D. Fermentation. Answer: A
19. Which of the following is used as drying agent for gases? A. Water B. Concentrated H₂SO₄ C. NaCl D. Sugar. Answer: B
20. The molecular formula of benzene is A. C₆H₆ B. C₆H₁₂ C. C₅H₆ D. C₄H₆. Answer: A
Post Utme Chemistry Past Questions and Answers
21. Which of the following is an exothermic reaction? A. Photosynthesis B. Respiration C. Melting D. Evaporation. Answer: B
22. The valency of nitrogen in NH₃ is A. 1 B. 2 C. 3 D. 5. Answer: C
23. Which of the following is a ketone? A. CH₃CHO B. CH₃COCH₃ C. CH₃COOH D. CH₃OH. Answer: B
24. The atomic radius decreases across a period due to A. Increase in neutrons B. Increase in nuclear charge C. Decrease in electrons D. Shielding effect. Answer: B
25. Which of the following is used in electroplating? A. Direct current B. Alternating current C. Heat D. Pressure. Answer: A
26. The oxidation number of chlorine in NaClO₃ is A. +1 B. +3 C. +5 D. -1. Answer: C
27. Which of the following is an aromatic compound? A. Ethane B. Benzene C. Ethene D. Propane. Answer: B
28. The process of rust prevention by coating with zinc is called A. Alloying B. Galvanization C. Electrolysis D. Reduction. Answer: B
29. Which of the following has the highest electronegativity? A. Cl B. F C. O D. N. Answer: B
30. The functional group in carboxylic acids is A. –OH B. –COOH C. –CHO D. –NH₂. Answer: B
31. Which of the following is a homogeneous mixture? A. Soil B. Air C. Sand and water D. Oil and water. Answer: B
32. The process of converting alkane to alkene is called A. Hydrogenation B. Cracking C. Polymerization D. Esterification. Answer: B
33. Which of the following is a reducing agent? A. O₂ B. H₂ C. Cl₂ D. NO₂. Answer: B
34. The shape of CO₂ molecule is A. Linear B. Bent C. Tetrahedral D. Trigonal. Answer: A
35. Which of the following is a primary alcohol? A. CH₃CH₂OH B. CH₃CHOHCH₃ C. CH₃COCH₃ D. C₆H₆. Answer: A
36. The pH of distilled water is A. 1 B. 5 C. 7 D. 9. Answer: C
37. Which of the following is used as an antiseptic? A. Ethanol B. Methane C. Benzene D. Propane. Answer: A
38. The process of removing electrons is called A. Reduction B. Oxidation C. Neutralization D. Sublimation. Answer: B
39. Which of the following is an ionic compound? A. CO₂ B. NaCl C. CH₄ D. NH₃. Answer: B
40. The number of valence electrons in oxygen is A. 4 B. 5 C. 6 D. 7. Answer: C
Post Utme Chemistry Past Questions and Answers
41. Which of the following is used in fermentation? A. Oxygen B. Yeast C. Nitrogen D. Hydrogen. Answer: B
42. The IUPAC name of CH₄ is A. Methane B. Ethane C. Propane D. Butane. Answer: A
43. Which of the following is a base? A. HCl B. NH₃ C. CO₂ D. SO₂. Answer: B
44. The oxidation number of hydrogen in H₂O is A. -1 B. +1 C. 0 D. +2. Answer: B
45. Which of the following is a polymerization reaction? A. Ethene to polyethene B. Combustion C. Neutralization D. Hydrolysis. Answer: A
46. The unit of molar mass is A. g/mol B. kg C. mol/dm³ D. J. Answer: A
47. Which of the following is a transition element? A. Na B. Ca C. Fe D. K. Answer: C
48. The bond in NaCl is A. Covalent B. Metallic C. Ionic D. Hydrogen. Answer: C
49. Which of the following is an example of esterification? A. Acid + alcohol B. Acid + base C. Base + salt D. Alcohol + alkane. Answer: A
50. The gas evolved during photosynthesis is A. CO₂ B. O₂ C. N₂ D. H₂. Answer: B
51. Which of the following is a halogen? A. Br B. Na C. Fe D. Ca. Answer: A
52. The colour of iodine is A. Brown B. Violet C. Yellow D. Green. Answer: B
53. Which of the following is used in making detergents? A. Hydrocarbons B. Sulphonates C. Alcohols D. Esters. Answer: B
54. The number of atoms in NH₃ is A. 2 B. 3 C. 4 D. 5. Answer: C
55. Which of the following is a non-metal? A. Cu B. Zn C. S D. Fe. Answer: C
56. The process of dissolving a solute in a solvent is called A. Diffusion B. Solution C. Solvation D. Dilution. Answer: C
57. Which of the following is an alkene? A. C₂H₆ B. C₂H₄ C. C₂H₂ D. CH₄. Answer: B
58. The formula of nitric acid is A. HNO₃ B. HCl C. H₂SO₄ D. H₂CO₃. Answer: A
59. Which of the following is a weak base? A. NaOH B. NH₃ C. KOH D. Ca(OH)₂. Answer: B
60. The process of converting liquid to solid is called A. Freezing B. Melting C. Evaporation D. Sublimation. Answer: A
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