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.

1,623 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

1,623 questions

Question 1 of 20 1,623 total questions

Question 801

waec 1988

Bubbling of carbon (IV)oxide into calcium hydroxide solution results in the formation of

ACaCO₃

BCuCO₃

CZnCO₃

DNa₂CO₃

EMgCO₃

View Explanation & Discuss

Question 802

waec 1988

What quantity of silver is deposited when 96500C of electricity is passed through a solution containing silver ions? (Ag = 108, 1F = 96500C)

A1.08g

B40g

C10,.8g

D21.6g

E108g

View Explanation & Discuss

Question 803

waec 1988

The following are heavy chemicals except

Atetraoxosulphate (IV) acid

Bcaustic soda

Csodium trioxocarbonate (IV)

Dethene

Edyes

View Explanation & Discuss

Question 804

waec 1988

The main characteristic feature of transition metals is that they

Ahave the same atomic size

Bare reducing agents

Cfrom ions easily

Dhave variable oxidation states

Eare highly electropositive

View Explanation & Discuss

Question 805

waec 1988

The following are uses of radioactive isotopes except for

Asterilization of medical equipment

Btracing reaction paths

Cdating elements

Dradiography

Edetermining equilibrum positions

View Explanation & Discuss

Question 806

waec 1988

Which of the following statements is not correct?

ACarbon exhibits allotropy

BSulphur exhibits allotropy

CChlorine exhibits allotopy

DNitrogen is a gas

EArgon is a noble gas

View Explanation & Discuss

Question 807

waec 1988

Which of the following is a neutral oxide?

ANitrogen (IV0 oxide

BCarbon (IV) oxide

CSulphur (IV) oxide

DPhodphoorus (IV) oxide

ENitrogen oxide

View Explanation & Discuss

Question 808

waec 1988

Which of the following types of hybridization gives rise to tetrahedral molecules?

Asp

Bsp²

Csp₃

Dsp³d

Esp³d²

View Explanation & Discuss

Question 809

waec 1988

Which of the following is used as an anaesthetic?

ACHI₃

BCHCI₃

CCH₃OH

DC₂H₅OH

ECHBr₃

View Explanation & Discuss

Question 810

waec 1988

Detergents are better than soaps for laundry because

Adetergents are synthetic while soaps are not

Bdetergents are more soluble in water than soaps

Cscum is precipitated when soaps are used with hard water but not with stergents

Dsoaps from soluble saits with ions causing hardness of water while detergents do not

Esoaps are in bars while detergents are in powder form

View Explanation & Discuss

Question 811

waec 1988

A salt which loses mass when exposed to air is

Ahygroscopic

Bdeliquescent

Cefflorescent

Dfluorescent

Eeffervescent

View Explanation & Discuss

Question 812

waec 1988

The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is

ACH₂

BCH₃

CC₂H₂

DC₂H₄

EC₂H₆

View Explanation & Discuss

Question 813

waec 1988

Given that 32.0g sulphur contains 6.02 x 10 23 sulphur atoms how many atoms are there in 2.70g of aluminium? {Al = 27, S =32}

A6.02 x 10 ²³

B3.01 x 10²²

C6.02 x 10²²

D5. 08 x 10²²

E3.01 x 10²²

View Explanation & Discuss

Question 814

waec 1988

Which of the following does not affect the rate of a chemical reaction?

AAddition or presence of a catalyst

BSize of the reacting particles

CThe enthalpy change for the reaction

DConcentration of the reactants

ETemperatureat which the reaction is carried out

View Explanation & Discuss

Question 815

waec 1988

Which of the following does not affect the rate of a chemical reaction?

AAddition or presence of a catalyst

BSize of the reacting particles

CThe enthalpy change for the reaction

DConcentration of the reactants

ETemperatureat which the reaction is carried out

View Explanation & Discuss

Question 816

waec 1988

Which of the following compound is aromatic?

ABenzene

BCyclobutane

CCyclopentane

DHexane

EEthene

View Explanation & Discuss

Question 817

waec 1988

The reaction represented by the equation NaOH_(aq) + HCI_(aq) → NaCI_(aq) + H₂O_(/)

Ais a double decomposition

Bis a neutralization

Cis reversible

Dis usually catalysed

Eattains equilibrium after a few seconds

View Explanation & Discuss

Question 818

waec 1988

The following are uses of sulphur except

Amanufacture of tetraoxosulphate (VI) acid

Bprevention of the growth of fungi

Cvulcanization rubber

Dmanufacture of dyes

Ecoating of steel to prevent rusting

View Explanation & Discuss

Question 819

waec 1988

An acid present in proteins is

Alactic acid

Bamino acid

Cpropanoic acid

Dpalmitic acid

Estearic acid

View Explanation & Discuss

Question 820

waec 1988

Equilibrium is said to be attained in reversible reaction when

Aall the reactants have been used up

Ball the products have been formed

Cthere is no further change in temperature

Dthe rates of the forward and backward reactions are equal

Ethe rate of formation of the products decreases with time

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