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 481

jamb 2011

What type of bond exits between an element X with atomic number 12 and Y with atomic number 17?

AElectrovalent

BMetallic

CCovalent

DDative

View Explanation & Discuss

Question 482

jamb 2011

The importance of sodium aluminate (III) in the treatment of water is to

Acause coagulation

Bneutralize acidity

Cprevent goitre and tooth decay

Dkill germs

View Explanation & Discuss

Question 483

jamb 2011

From the diagram above, find the amount of solute deposited when 200 cm\(^3\) of the solution is cooled from 55°C to 40°C.

A0.10 mole

B0.20mole

C0.01 mole

D0.02 mole

View Explanation & Discuss

Question 484

jamb 2011

The arrangement of particles in crystal lattices can be studied using

AX - rays

Bγ - rays

Cα - rays

Dβ - rays

View Explanation & Discuss

Question 485

jamb 2011

The molecular lattice of iodine is held together by

Adative bond

Bmetallic bond

Chydrogen bond

Dvan der Waal's forces

View Explanation & Discuss

Question 486

jamb 2011

An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is

A16

B15

C46

D31

View Explanation & Discuss

Question 487

jamb 2011

The relative atomic mass of a naturally occurring lithium consisting of 90% \(^7 _3\)Li and \(^6 _3\)10% Li is

A6.9

B7.1

C6.2

D6.8

View Explanation & Discuss

Question 488

jamb 2011

Which of the following questions is correct about the periodic table?

AThe non-metallic properties of the elements tend to decrease across each period

BThe valence electrons of the elements increase progressively across the period

CElements in the same group have the same numbeer of electron shells

DElements in the same period have the number of valence electrons

View Explanation & Discuss

Question 489

jamb 2011

From the diagram above, an ideal can be represented by

View Explanation & Discuss

Question 490

jamb 2011

Which of the following properties is NOT peculiar to matter?

Akinetic energy of particles increase from solid to gas

BRandom motion of particles increases from liquid to gas

COrderliness of particles increases from gas to liquid

DRandom motion of particles increases from gas to solid

View Explanation & Discuss

Question 491

jamb 2011

What is the concentration of a solution containing 2g of NaOH in 100cm³ of solution?
[Na = 23, O = 16, H = 1]

A0.40 mol dm^-3

B0.50 mol dm^-3

C0.05 mol dm^-3

D0.30 mol dm^-3

View Explanation & Discuss

Question 492

jamb 2010

In the diagram above, the gas produced is?

ANO

BNO₂

CN₂O

DN₂O₄

View Explanation & Discuss

Question 493

jamb 2010

In the diagram above, the purpose of the asbestos to?

Aabsorb impurities

Bcatalyze the reaction

Csolidify the gas

Ddry the gas

View Explanation & Discuss

Question 494

jamb 2010

The compound that is used as an anesthetic is?

ACCl₄

BCH Cl₃

CCH₂Cl₂

DCH₃Cl

View Explanation & Discuss

Question 495

jamb 2010

Two hydrocarbons X and Y were treated with bromine water. X decolorised the solution and Y did not not. Which class of compound does Y belong?

ABenzene

BAlkynes

CAlkenes

DAlkanes

View Explanation & Discuss

Question 496

jamb 2010

The haloalkanes used in dry-cleaning industries are?

Atrichloromethane and tetrachloromethane

Bchloroethene and dichloroethene

Ctrichloroethene and tetrachloroethene

Dchloroethane and dichloroethene

View Explanation & Discuss

Question 497

jamb 2010

One of the major uses of alkane is?

Aas domestic and industrial fuel

Bin the hydrogenation of oils

Cin the textile industries

Din the production of plastics

View Explanation & Discuss

Question 498

jamb 2010

The correct order of increasing boiling points of the following compounds C3H7OH, C7H16 and C4H10 is?

AC₃H₇OH → C₄H₁₀ → C₇H₁₀

BC₄H₁₀ → C₇H₁₆ → C₃H₇OH

CC₇H₁₆ → C₃H₇OH → C₄H₁₀

DC₄H₁₀ → C₃H₇OH → C₇H₁₆

View Explanation & Discuss

Question 499

jamb 2010

The final products of the reaction between methane and chlorine in the presence of ultraviolet light are hydrogen chloride and?

Atricloromethane

Bdichloromethane

Ctetrachloromethane

Dchloromethane

View Explanation & Discuss

Question 500

jamb 2010

Which of the following is used to hasten the ripening of fruit?

AEthene

BEthanol

CEthyne

DEthane

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