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 571

waec 2001

Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?

ACopper turnings

BCopper (ll) trioxocarbonate (IV)

CCopper (ll) oxide

DCopper alloy

View Explanation & Discuss

Question 572

waec 2001

A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by

Aevaporation

Bsublimation

Cdistillation

Dfiltration

View Explanation & Discuss

Question 573

waec 2001

Which of the following pairs of reagents react to produce hydrogen?

AZinc and concentrated trioxonitrate (V) acid

BWater and calcium dicarbide

CCopper and dilute hydrochloric acid

DMagnesium and dilute tetraoxosulphate (VI) acid

View Explanation & Discuss

Question 574

waec 2001

P\(_{TOTAL}\) = P\(_1\) + P\(_2\) + P\(_3\) + ...Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of

AGraham's law

BGay-Lussac's Law

CBoyle's law

DDalton's law

View Explanation & Discuss

Question 575

waec 2001

Which of the following statements about ideal gases is/are correct? 1. The cohesive forces between their particles are negligible ll. They have no definite volume but occupy the volume of their containers III. They are not compressible IV. Their particles collide with loss of energy

Al only

Bl and ll only

Cl, ll and lll only

Dl, ll, lll, and IV

View Explanation & Discuss

Question 576

waec 2001

Which of the following features of a human skeleton can be determined by carbon-dating?

AHeight

BMass

CAge

DRace

View Explanation & Discuss

Question 577

waec 2001

A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of

Aalpha particles and gamma rays

Balpha and beta particles

Cbeta particles and gamma rays

Dalpha particles only

View Explanation & Discuss

Question 578

waec 2001

Which of the following compounds is covalent?

ACaCI₂

BMgO

CNaN

DCH₄

View Explanation & Discuss

Question 579

waec 2001

What is responsible for metallic bonding?

ASharing of electrons between the metal atoms

BAttraction between the atomic unclei and cloud of electrons

Ctransfer of electrons from one atom to another

DAttraction between positive and negative ions

View Explanation & Discuss

Question 580

waec 2001

The presence of unpaired electrons in an atom of a transition metal gives rise to

Aparamagnetism

Bmalleability

Cductility

Dshiny appearance

View Explanation & Discuss

Question 581

waec 2001

The atom of an element X combines with aluminium (\(_{13}\)AI). What is the formula of the compound formed?

AAIX ₂

BAI ₂X

CAI₂X ₂

DAI ₂X ₃

View Explanation & Discuss

Question 582

waec 2001

Elements which belong to the same group in the Periodic Table are characterized by

Adifference of +1 in the oxidation numbers of successive members

Bpresence of the same number of outermost electrons in the respective atoms

Cdifference of 14 atomic mass units between successive members

Dpresence of the same number of electron shells in the respective atoms

View Explanation & Discuss

Question 583

waec 2000

P,Q,R and S are metals in the same group in the Periodic Table but in periods 3,4, 5 and 6 respectively which of them loses electrons least readily?

View Explanation & Discuss

Question 584

waec 2000

Given that the electronic configuration of an element X is 1s22s22p63s 23p4, it can be deduced that X

Abelongs to group VI in the Periodic Table

Bbelongs to periodic Table

Ccontains 3 unpaired electrons in the ground state

Dhas atomic number 27

View Explanation & Discuss

Question 585

waec 2000

What is the mass number of an element if its atom contains 10 protons, 10 electrons and 12 neutrons?

A32

B22

C20

D10

View Explanation & Discuss

Question 586

waec 2000

Allotropes of an element differ in their

Aphysical properties

Bchemical properties

Cmass numbers

Delectronic configuration

View Explanation & Discuss

Question 587

waec 2000

A plastic which cannot be softened by heat is described as

Athermosetting

Bnon-biodegradable

Cthermoplastic

Dmalleable

View Explanation & Discuss

Question 588

waec 2000

Biotechnology is applied in the following except

Abaking industry

Bwine production

Cproduction of antibiotics

Dmanufacture of soap

View Explanation & Discuss

Question 589

waec 2000

If 20 cm3 of distilled water is added to 80 cm3 of 0.50 mol dm-3 hydrochloric acid, the concentration of the acid will change to

A20 mol dm^-3

B0.40 mol dm^-3

C2.00 mol dm^-3

D5.00 mol dm ^-3

View Explanation & Discuss

Question 590

waec 2000

Which of the following on burning in air contributes to acid rain?

ASulphur

BMagnesium

CAluminium

DZinc

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