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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.

52 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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52 questions

Question 1 of 12 52 total questions

Question 21

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

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Question 22

waec 2001

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

Aevaporation

Bsublimation

Cdistillation

Dfiltration

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Question 23

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

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Question 24

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

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Question 25

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

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Question 26

waec 2001

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

AHeight

BMass

CAge

DRace

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Question 27

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

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Question 28

waec 2001

Which of the following compounds is covalent?

ACaCI₂

BMgO

CNaN

DCH₄

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Question 29

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

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Question 30

waec 2001

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

Aparamagnetism

Bmalleability

Cductility

Dshiny appearance

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Question 31

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

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Question 32

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

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