Classroom

Chemistry Past Questions

Study and practice Chemistry past questions with answers and detailed explanations. Then test your knowledge using our interactive CBT practice platform and prepare confidently for your upcoming examinations.

2,505 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

Select subject

Download PHP app Ask a Question Check Syllabus Past Question Videos Topic Video Lessons

Take a test

Custom CBT

Create and set up a CBT environment with your preferred subjects.

JAMB CBT Simulator

Practice JAMB CBT with real UTME past questions in CBT format.

WAEC CBT Practice 2026 Simulator

CB-WASSCE styled past question practice.

NECO CBT Practice 2026 Simulator

SSCE & GCE styled past question practice.

Past Questions

2,505 questions

Question 1 of 20 2,505 total questions

Question 401

jamb 2014

Due to the unstable nature of ethyne, it is stored by dissolving in

Aethane-1,2-diol

Bpropanol

Cethanoic acid

Dpropanone

View Explanation & Discuss

Question 402

jamb 2014

Ethyne is passed through a hot tube containing organo-nickel catalyst to produce

Aisoprene

Bpolythene

Cethanol

Dbenzene

View Explanation & Discuss

Question 403

jamb 2014

The alkanol obtained from the production of soap is

Apropanol

Bethanol

Cglycerol

Dmethanol

View Explanation & Discuss

Question 404

jamb 2014

The general formula of haloalkanes where X represents the halide is

AC_n H _2n-1X.

BC _nH _2nX.

CC _nH _2n+2 X

DC _nH _2n+1X

View Explanation & Discuss

Question 405

jamb 2014

A few drops of NaOH solution was added to an unknown salt forming a white precipitate which is insoluble in excess solution. The cation likely present is

AZn²⁺

BPb²⁺

CCa²⁺

DAl³⁺

View Explanation & Discuss

Question 406

jamb 2014

A compound that gives a brick-red colour to a non-luminous flame is likely to contain

Acopper ions

Bsodium ions

Ccalcium ions

DPotassium ions

View Explanation & Discuss

Question 407

jamb 2014

In the electrolytic extraction of calcium from calcium chloride, the cathode is

Azinc

Bgraphite

Cplatinum

Diron

View Explanation & Discuss

Question 408

jamb 2014

In the extraction of sodium from fused sodium chloride, the anode is made of platinum because

Asodium is formed at the anode

Bchlorine is formed at the anode

Csodium does not react with platinum

Dchlorine does not react with platinum

View Explanation & Discuss

Question 409

jamb 2014

Fluorine does not occur in the free state in nature because

Ait is a poisonous gas

Bit belongs to the halogen family

Cit is inert

Dof its high reactivity

View Explanation & Discuss

Question 410

jamb 2014

In a chemical reaction, the change in concentration of a reactant with time is

Aentropy of reaction

Benthalpy of reaction

Crate of reaction

Dorder of reaction

View Explanation & Discuss

Question 411

jamb 2014

In an equilibrium reaction, which of the following conditions indicates that maximum yield of the product will be obtained?

AEquilibrium constant is very large

B∆H - T∆S = O

C∆ H > T ∆ S

DEquilibrium constant is less than zero

View Explanation & Discuss

Question 412

jamb 2014

If the change in free energy of a system is -899 Jmol^-1 and the entropy change is 10Jmol^-1k^-1 at 250C, calculate the enthalpy change.

A+2081 Jmol^-1

B-2081 Jmol^-1

C-649 Jmol^-1

D+649 Jmol^-1

View Explanation & Discuss

Question 413

jamb 2014

How many faraday of electricity is required to produce 0.25 mole of copper?

A1.00F

B0.01F

C0.05F

D0.50F

View Explanation & Discuss

Question 414

jamb 2014

Calculate the quantity of electricity in coulombs required to liberate 10g of copper from a copper compound

[Cu=64, F = 96500 Cmol-1]

A32395.5

B30156.3

C60784.5

D15196.5

View Explanation & Discuss

Question 415

jamb 2014

\(H_2O_{(g)} + C_{(s)} → H_{2(g)} + CO_{(g)}\)

The oxidizing agent in the reaction above is

ACO_(g)

BC_(s)

CH₂O_(g)

DH₍₂₎_(g)

View Explanation & Discuss

Question 416

jamb 2014

Zn _(s) + CuSO ₄(aq) → ZnSO ₄(aq) + Cu _(s)
In the reaction above, the oxidation number of the reducing agent changes from

A0 to + 4

B0 to + 2

C+ 1 to + 2

D+ 1 to + 3

View Explanation & Discuss

Question 417

jamb 2014

Which of the following salts will turn blue litmus red?

ASodium tetrahydroxozincate (ll)

BSodium hydrogentetraoxosulphate (VI)

CSodium trioxocarbonate (lV)

DZinc chloride hydroxide

View Explanation & Discuss

Question 418

jamb 2014

The mathematical expression of PH is

Alog ₁₀[OH^-]

Blog ₁₀1/[H ₃ O⁺]

Clog ₁₀[H ₃ O⁺]

Dlog ₁₀1/[OH ^-]

View Explanation & Discuss

Question 419

jamb 2014

The colour of litmus in a neutral medium is

Apurple

Bpink

Cyellow

Dorange

View Explanation & Discuss

Question 420

jamb 2014

The basicity of CH₃COOH is

View Explanation & Discuss

Question Navigator

Current

Chemistry Past Questions

Take a test

Custom CBT

JAMB CBT Simulator

WAEC CBT Practice 2026 Simulator

NECO CBT Practice 2026 Simulator

Past Questions

Question Navigator

MathsFaculty