evidencechidozie@gmail.comIn Nigerian secondary schools, chemistry is a required subject, particularly for those enrolled in the scientific stream. It covers topics including organic chemistry, inorganic chemistry, physical chemistry, and biochemistry as it investigates the make-up, structure, characteristics, and reactions of matter. Students who want to study medicine, pharmacy, chemical engineering, or environmental science in college must take this subject. Because it offers the fundamental knowledge needed for various professions, it also has a big impact on national exams like WAEC, NECO, and JAMB.
Since JAMB frequently revisits important topics and problems every year, going over previous questions is a smart strategy for candidates taking Chemistry. To do well on the tests and build a solid foundation for future academic or professional endeavors in science-related fields, it is essential to fully comprehend these recurrent themes in these questions. To aid your preparation, answers have been included to streamline your study process and enhance your performance. Jamb Chemistry Past Questions
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Jamb Chemistry Past Questions
SECTION A
<p>1. The atomic number of an element is equal to the number of
(a) Protons in the nucleus
(b) Neutrons in the nucleus
(c) Electrons in the outer shell
(d) Electrons and neutrons combined
The correct answer is: (a) Protons in the nucleus<p>2. A solution with a pH of 7 is
(a) Acidic
(b) Basic
(c) Neutral
(d) Amphoteric
The correct answer is: (c) Neutral<p>3. The number of periods in the modern periodic table is
(a) 7
(b) 8
(c) 9
(d) 10
The correct answer is: (a) 7<p>4. An isotope of an element has the same number of
(a) Protons but different neutrons
(b) Neutrons but different protons
(c) Electrons and neutrons
(d) Electrons and protons combined
The correct answer is: (a) Protons but different neutrons
5. The chemical formula for ammonia is
(a) NH3
(b) H2O
(c) CO2
(d) CH4
The correct answer is: (a) NH3
<p>6. The law that states that the total mass of reactants is equal to the total mass of products in a chemical reaction is
(a) Boyle’s law
(b) Charles’s law
(c) Conservation of mass
(d) Avogadro’s law
The correct answer is: (c) Conservation of mass<p>7. A covalent bond is formed by
(a) Transfer of electrons
(b) Sharing of electrons
(c) Loss of protons
(d) Gain of neutrons
The correct answer is: (b) Sharing of electrons<p>8. The state of matter with no fixed volume and shape is
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
The correct answer is: (c) Gas<p>9. The main component of natural gas is
(a) Methane
(b) Ethane
(c) Butane
(d) Propane
The correct answer is: (a) Methane
10. The element used in making thermometers is
(a) Lead
(b) Mercury
(c) Aluminum
(d) Sodium
The correct answer is: (b) Mercury
SECTION B
11. The chemical name for NaCl is ?
(a) Sodium carbonate
(b) Sodium chloride
(c) Sodium hydroxide
(d) Sodium nitrate
The correct answer is actually: (b) Sodium chloride
12. The process by which a liquid changes into a gas is called ?
(a) Condensation
(b) Evaporation
(c) Freezing
(d) Sublimation
The correct answer is actually: (b) Evaporation
13. Which of these is a noble gas?
(a) Oxygen
(b) Nitrogen
(c) Argon
(d) Hydrogen
The correct answer is actually: (c) Argon
14. The SI unit for measuring the amount of substance is the ?
(a) Mole
(b) Gram
(c) Liter
(d) Kilogram
The correct answer is actually: (a) Mole
15. The chemical formula for sulfuric acid is ?
(a) HCl
(b) HNO3
(c) H2SO4
(d) H3PO4
The correct answer is actually: (c) H2SO4
16. An endothermic reaction is one that ?
(a) Releases heat
(b) Absorbs heat
(c) Produces light
(d) Releases gas
The correct answer is actually: (b) Absorbs heat
17. A mixture of sand and water can be separated by ?
(a) Filtration
(b) Distillation
(c) Evaporation
(d) Crystallization
The correct answer is actually: (a) Filtration
18. The gas that turns limewater milky is ?
(a) Oxygen
(b) Carbon dioxide
(c) Hydrogen
(d) Nitrogen
The correct answer is actually: (b) Carbon dioxide
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19. The process of coating iron with zinc to prevent rusting is called ?
(a) Electrolysis
(b) Galvanization
(c) Crystallization
(d) Sublimation
The correct answer is actually: (b) Galvanization
20. The lightest element in the periodic table is ?
(a) Hydrogen
(b) Helium
(c) Lithium
(d) Oxygen
The correct answer is actually: (a) Hydrogen
SECTION C
21. The atomic mass of an element is the sum of its ?
>>>>>>>(a) Protons and neutrons
(b) Electrons and neutrons
(c) Protons and electrons
(d) Electrons only
The correct answer is actually: (a) Protons and neutrons
22. The process by which plants make food using sunlight is called ?
(a) Respiration
(b) Fermentation
(c) Photosynthesis
(d) Combustion
The correct answer is actually: (c) Photosynthesis
23. The element that exists in different forms such as graphite and diamond is ?
(a) Silicon
(b) Carbon
(c) Sulfur
(d) Phosphorus
The correct answer is actually: (b) Carbon
24. The scientist who proposed the atomic theory is ?
(a) J.J. Thomson
(b) John Dalton
(c) Ernest Rutherford
(d) Niels Bohr
The correct answer is actually: (b) John Dalton
25. The process of converting a solid directly into a gas is called ?
(a) Condensation
(b) Sublimation
(c) Evaporation
(d) Melting
The correct answer is actually: (b) Sublimation
26. The study of hydrocarbons is called ?
(a) Organic chemistry
(b) Inorganic chemistry
(c) Physical chemistry
(d) Analytical chemistry
The correct answer is actually: (a) Organic chemistry
27. A liquid that cannot dissolve any more solute at a given temperature is called ?
(a) Unsaturated solution
(b) Saturated solution
(c) Dilute solution
(d) Concentrated solution
The correct answer is actually: (b) Saturated solution
28. The metal that reacts violently with water is ?
(a) Sodium
(b) Copper
(c) Iron
(d) Aluminum
The correct answer is actually: (a) Sodium
29. The pH of a strong acid is likely to be ?
>>>>>>>(a) Less than 7
(b) Greater than 7
(c) Equal to 7
(d) Exactly 14
The correct answer is actually: (a) Less than 7
30. The process of removing impurities from crude oil is known as ?
(a) Fractional distillation
(b) Crystallization
(c) Decantation
(d) Filtration
The correct answer is actually: (a) Fractional distillation
SECTION D
31. The compound used to bleach clothes is ?
(a) Hydrogen peroxide
(b) Sodium chloride
(c) Calcium hypochlorite
(d) Sodium hydroxide
The correct answer is actually: (c) Calcium hypochlorite
32. The universal solvent is ?
(a) Alcohol
(b) Water
(c) Benzene
(d) Ether
The correct answer is actually: (b) Water
33. The chemical formula for methane is ?
(a) CH4
(b) C2H6
(c) C3H8
(d) C4H10
The correct answer is actually: (a) CH4
34. Electrolysis of water produces ?
>>>>>>>(a) Oxygen and carbon dioxide
(b) Oxygen and hydrogen
(c) Hydrogen and nitrogen
(d) Hydrogen and methane
The correct answer is actually: (b) Oxygen and hydrogen
35. Which of the following is a non-metal ?
(a) Aluminum
(b) Phosphorus
(c) Copper
(d) Iron
The correct answer is actually: (b) Phosphorus
36. The functional group in alcohols is ?
(a) -OH
(b) -COOH
(c) -CHO
(d) -C=O
The correct answer is actually: (a) -OH
37. Rusting of iron is an example of ?
(a) Oxidation reaction
(b) Reduction reaction
(c) Neutralization reaction
(d) Precipitation reaction
The correct answer is actually: (a) Oxidation reaction
38. The gas used in the manufacture of fertilizers is ?
(a) Oxygen
(b) Ammonia
(c) Methane
(d) Nitrogen
The correct answer is actually: (b) Ammonia
39. The metal with the highest electrical conductivity is ?
(a) Gold
(b) Copper
(c) Silver
(d) Aluminum
The correct answer is actually: (c) Silver
40. A chemical reaction that absorbs energy from the surroundings is ?
(a) Exothermic
(b) Endothermic
(c) Combustion
(d) Neutralization
The correct answer is actually: (b) Endothermic
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