JAMB Chemistry Past Questions and Answers

957 questions from 16 JAMB Chemistry papers, 2010 to 2025. Pick a year to see 10 of its questions with answers.

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Sample questions from JAMB 2025

JAMB 2025Question 1 · Chemistry of Non-metals and Gases

The expression

\frac{P _{1} V _{1}}{T _{1}} = \frac{P _{2} V _{2}}{T _{2}}

represents

A.Avogadro's law
B.Boyle's law
C.General gas law
D.Charles' law

Show answer

Answer: C. General gas law

This expression combines Boyle's law and Charles' law into the general (combined) gas law, relating pressure, volume and temperature of a fixed mass of gas.

JAMB 2025Question 2 · Electrochemistry and Redox Reactions

The time required to deposit

4.5 g

of copper from

C u S O_{4}

solution by passing a current of 2.5 Amperes is (Cu =

64 g

; 1F =

96500 C mo l^{- 1}

)

A.2714 sec
B.2527 sec
C.5428 sec
D.6785 sec

Show answer

Answer: C. 5428 sec

$Q = I t$ ; mass $4.5 g \times \frac{2 \times 96500}{64} = 13570.3 C$ ; $t = \frac{13570.3}{2.5} \approx 5428$ sec.

JAMB 2025Question 3 · Organic Chemistry

Consider the reaction:

C H_{4} + C l_{2} UV light C H_{3} C l + H C l

. This reaction is best classified as

A.neutralization
B.substitution
C.polymerization
D.oxidation

Show answer

Answer: B. substitution

A hydrogen atom in methane is replaced (substituted) by a chlorine atom, so this is a substitution reaction, typical of alkanes reacting with halogens under UV light.

JAMB 2025Question 4 · Organic Chemistry

The compound with structural formula

C H_{3} - C O - N H_{2}

belongs to which class of organic compounds?

A.alkylamine
B.alkanone
C.alkanamide
D.amino acid

Show answer

Answer: C. alkanamide

$C H_{3} C O N H_{2}$ (ethanamide) contains the $- C O N H_{2}$ functional group, characteristic of an alkanamide (amide).

JAMB 2025Question 5 · Quantitative Chemistry

What is the molecular mass of an alkanoic acid, if 0.5 mole of the acid weighs

44 g

A.72
B.88
C.60
D.46

Show answer

Answer: B. 88

Molar mass $= \frac{44 g}{0.5 m o l} = 88 g / m o l$ .

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Topics that come up most

Organic Chemistry · 183
Physical Chemistry · 133
Chemistry of Non-metals and Gases · 117
Atomic Structure and Chemical Bonding · 106
Environmental and Industrial Chemistry · 99
Electrochemistry and Redox Reactions · 79
Quantitative Chemistry · 75
Chemistry of Metals · 73
Acids, Bases, and Salts · 53
Periodicity and Inorganic Chemistry · 39

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JAMB Chemistry Past Questions and Answers

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