JAMB Chemistry Past Questions and Answers (CBT Practice)

 

Introduction

Chemistry in JAMB (UTME) involves the study of matter, its composition, properties, reactions, and the changes it undergoes. It covers physical chemistry, organic chemistry, inorganic chemistry, periodic table trends, and practical chemistry concepts. Success in Chemistry requires understanding concepts, memorizing key reactions, and consistent CBT practice. This set contains 100 JAMB-standard multiple-choice questions with properly shuffled options A–D and correct answers.

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OBJECTIVE QUESTIONS

Instruction: Choose the correct option A–D.

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1–25: Basic Chemistry and Atomic Structure

1. Chemistry is the study of
   A. living things B. matter and its properties C. plants only D. energy only
   Answer: B

2. The smallest particle of an element is
   A. molecule B. atom C. compound D. ion
   Answer: B

3. Proton carries
   A. negative charge B. positive charge C. no charge D. neutral charge
   Answer: B

4. Electron carries
   A. positive charge B. negative charge C. no charge D. neutral charge
   Answer: B

5. Neutron is
   A. positively charged B. negatively charged C. neutral D. ionic
   Answer: C

6. The atomic number is the number of
   A. neutrons B. protons C. electrons + neutrons D. molecules
   Answer: B

7. Mass number is the sum of
   A. protons only B. neutrons only C. protons and neutrons D. electrons only
   Answer: C

8. Isotopes are atoms with same
   A. mass number B. atomic number C. neutrons only D. electrons only
   Answer: B

9. The nucleus contains
   A. electrons only B. protons and neutrons C. neutrons only D. electrons and protons
   Answer: B

10. The arrangement of electrons is called
    A. shell structure B. electronic configuration C. atomic mass D. isotope
    Answer: B

11. Maximum electrons in first shell is
    A. 1 B. 2 C. 4 D. 8
    Answer: B

12. Maximum electrons in second shell is
    A. 2 B. 4 C. 8 D. 16
    Answer: C

13. Periodic table was developed by
    A. Dalton B. Mendeleev C. Rutherford D. Bohr
    Answer: B

14. Elements in the same group have same
    A. atomic mass B. number of electrons C. valence electrons D. neutrons
    Answer: C

15. The periodic table is arranged in order of
    A. mass number B. atomic number C. density D. volume
    Answer: B

16. A metal is generally
    A. brittle B. good conductor C. non-conductor D. gas
    Answer: B

17. Non-metals are usually
    A. shiny B. malleable C. poor conductors D. ductile
    Answer: C

18. Metalloid shows properties of
    A. metals only B. non-metals only C. both metals and non-metals D. gases only
    Answer: C

19. The most reactive group of metals is
    A. group 1 B. group 2 C. group 7 D. group 0
    Answer: A

20. Noble gases are found in
    A. group 0 B. group 1 C. group 2 D. group 7
    Answer: A

21. Atomic mass unit is
    A. kg B. amu C. g/cm³ D. mol
    Answer: B

22. Avogadro’s number is
    A. 6.02 × 10²³ B. 3.00 × 10⁸ C. 9.8 D. 1.6 × 10⁻¹⁹
    Answer: A

23. Mole is the amount of substance containing
    A. 6 atoms B. Avogadro’s number of particles C. 10 particles D. 1 particle
    Answer: B

24. Chemical bond involves
    A. energy only B. sharing or transfer of electrons C. protons only D. neutrons only
    Answer: B

25. Ionic bond is formed by
    A. sharing electrons B. transfer of electrons C. sharing protons D. losing neutrons
    Answer: B

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26–50: Chemical Reactions and Stoichiometry

26. A compound is made of
    A. one element B. two or more elements chemically combined C. atoms only D. molecules only
    Answer: B

27. Mixture is
    A. chemically combined B. physically combined substances C. element only D. compound only
    Answer: B

28. Separation of mixtures can be done by
    A. bonding B. physical methods C. reaction only D. heating only
    Answer: B

29. Filtration is used to separate
    A. solid and liquid B. gas and solid C. two liquids D. two gases
    Answer: A

30. Distillation is used to separate
    A. solids B. miscible liquids C. gases D. metals
    Answer: B

31. Evaporation is used to obtain
    A. gas B. dissolved solid C. liquid only D. compound
    Answer: B

32. Chemical reaction involves
    A. physical change only B. formation of new substances C. no change D. freezing only
    Answer: B

33. Catalyst is a substance that
    A. slows reaction B. speeds reaction C. stops reaction D. changes product
    Answer: B

34. Exothermic reaction releases
    A. heat B. cold C. light only D. sound only
    Answer: A

35. Endothermic reaction absorbs
    A. heat B. light C. sound D. pressure
    Answer: A

36. Acid turns blue litmus paper
    A. green B. red C. yellow D. purple
    Answer: B

37. Base turns red litmus paper
    A. blue B. red C. green D. white
    Answer: A

38. pH of acid is
    A. >7 B. <7 C. =7 D. 10
    Answer: B

39. Neutral solution has pH
    A. 0 B. 7 C. 14 D. 5
    Answer: B

40. Salt is formed by
    A. acid + base B. acid + acid C. base + base D. metal + gas
    Answer: A

41. Common salt is
    A. NaCl B. KCl C. CaCO₃ D. HCl
    Answer: A

42. Water is
    A. element B. compound C. mixture D. atom
    Answer: B

43. Chemical equation must be
    A. unbalanced B. balanced C. random D. incomplete
    Answer: B

44. Law of conservation of mass states mass is
    A. lost B. created C. conserved D. destroyed
    Answer: C

45. Molar mass is measured in
    A. g/mol B. kg C. mol D. cm³
    Answer: A

46. Standard temperature is
    A. 0°C B. 25°C C. 100°C D. 50°C
    Answer: B

47. Standard pressure is
    A. 1 atm B. 2 atm C. 5 atm D. 10 atm
    Answer: A

48. Gas pressure is measured in
    A. joule B. pascal C. watt D. mole
    Answer: B

49. Volume of gas is measured in
    A. liter B. kg C. meter D. gram
    Answer: A

50. Rate of reaction increases with
    A. decrease temperature B. increase temperature C. no change D. decrease pressure only
    Answer: B

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51–100: Organic Chemistry, States of Matter & Industrial Chemistry

51. Organic chemistry is the study of
    A. metals B. carbon compounds C. gases only D. water only
    Answer: B

52. Hydrocarbons contain
    A. oxygen only B. carbon and hydrogen C. nitrogen only D. metals
    Answer: B

53. Alkane is
    A. unsaturated B. saturated hydrocarbon C. acid D. salt
    Answer: B

54. Alkene contains
    A. single bond only B. double bond C. triple bond only D. no bond
    Answer: B

55. Alkyne contains
    A. double bond B. triple bond C. single bond D. ionic bond
    Answer: B

56. Example of alkane is
    A. ethane B. ethene C. ethyne D. benzene
    Answer: A

57. Fractional distillation is used in
    A. water purification B. crude oil refining C. salt making D. paper making
    Answer: B

58. LPG stands for
    A. Liquid Petroleum Gas B. Light Petroleum Gas C. Low Power Gas D. Liquid Pure Gas
    Answer: A

59. Crude oil is
    A. pure substance B. mixture C. element D. compound only
    Answer: B

60. Gasoline is obtained from
    A. water B. crude oil C. air D. salt
    Answer: B

61. States of matter are
    A. solid only B. solid, liquid, gas C. liquid only D. gas only
    Answer: B

62. Solid has
    A. fixed shape B. no shape C. gas shape D. liquid shape
    Answer: A

63. Liquid has
    A. fixed shape B. no volume C. fixed volume D. no mass
    Answer: C

64. Gas has
    A. fixed shape B. fixed volume C. no fixed shape or volume D. solid shape
    Answer: C

65. Diffusion is faster in
    A. solids B. liquids C. gases D. metals only
    Answer: C

66. Evaporation occurs at
    A. boiling point only B. any temperature C. 0°C only D. freezing point
    Answer: B

67. Boiling is
    A. slow evaporation B. rapid vaporization C. freezing D. melting
    Answer: B

68. Melting is change from
    A. liquid to gas B. solid to liquid C. gas to solid D. liquid to solid
    Answer: B

69. Freezing is change from
    A. solid to liquid B. liquid to solid C. gas to liquid D. solid to gas
    Answer: B

70. Sublimation is
    A. solid to gas B. gas to solid C. liquid to gas D. solid to liquid
    Answer: A

71. Example of sublimation is
    A. salt B. iodine C. sugar D. water
    Answer: B

72. Oxygen supports
    A. combustion B. freezing C. melting D. condensation
    Answer: A

73. Carbon dioxide is used in
    A. respiration B. photosynthesis C. burning D. melting
    Answer: B

74. Rusting is a reaction of iron with
    A. hydrogen B. oxygen and water C. nitrogen D. carbon
    Answer: B

75. Rusting is an example of
    A. physical change B. chemical change C. nuclear change D. reversible change
    Answer: B

76. Catalyst used in Haber process is
    A. iron B. copper C. zinc D. platinum
    Answer: A

77. Haber process produces
    A. oxygen B. ammonia C. hydrogen D. chlorine
    Answer: B

78. Ammonia is used in making
    A. fertilizers B. glass C. cement D. plastics only
    Answer: A

79. Sulfuric acid is
    A. weak acid B. strong acid C. base D. salt
    Answer: B

80. Acid rain is caused by
    A. CO₂ only B. SO₂ and NOx C. oxygen D. nitrogen only
    Answer: B

81. Water is universal
    A. acid B. solvent C. base D. gas
    Answer: B

82. Solute is
    A. dissolving medium B. substance dissolved C. solution only D. gas
    Answer: B

83. Solvent is
    A. dissolved substance B. dissolving medium C. solid only D. gas only
    Answer: B

84. Concentration means
    A. amount of solute B. amount of solvent C. colour D. density only
    Answer: A

85. Electrolysis uses
    A. heat B. electricity C. light D. pressure
    Answer: B

86. Electroplating is coating metal using
    A. heat B. electricity C. water D. acid
    Answer: B

87. Anode is
    A. negative electrode B. positive electrode C. neutral electrode D. gas electrode
    Answer: B

88. Cathode is
    A. positive electrode B. negative electrode C. neutral electrode D. gas electrode
    Answer: B

89. Reduction is
    A. loss of electrons B. gain of electrons C. gain of protons D. loss of neutrons
    Answer: B

90. Oxidation is
    A. gain of electrons B. loss of electrons C. gain of neutrons D. no change
    Answer: B

91. Redox reaction involves
    A. oxidation only B. reduction only C. both oxidation and reduction D. no reaction
    Answer: C

92. Indicator used in acid-base titration is
    A. water B. phenolphthalein C. salt D. sugar
    Answer: B

93. Neutralization produces
    A. acid only B. salt and water C. gas only D. base only
    Answer: B

94. Hard water contains
    A. sodium only B. calcium and magnesium salts C. oxygen D. hydrogen
    Answer: B

95. Soft water is
    A. rainwater B. sea water C. salt water D. mineral water only
    Answer: A

96. Chlorine is used for
    A. cooking B. water purification C. fertilizing D. rusting
    Answer: B

97. Period is a row in periodic table
    A. vertical B. horizontal C. diagonal D. circular
    Answer: B

98. Group is a column in periodic table
    A. vertical B. horizontal C. diagonal D. spiral
    Answer: A

99. Metals lose electrons to form
    A. anions B. cations C. neutrons D. molecules
    Answer: B

100. Chemistry helps in understanding
     A. only plants B. matter and its changes C. only animals D. only machines
     Answer: B

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EXAM SUCCESS TIPS

• Master periodic table trends
• Practice balancing equations daily
• Learn organic chemistry basics
• Understand mole concept and calculations
• Revise gas laws and reactions
• Focus on acids, bases, and salts
• Practice past JAMB CBT questions
• Memorize common industrial processes
• Study oxidation and reduction well
• Solve timed chemistry practice tests