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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.

90 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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90 questions

Question 1 of 20 90 total questions

Question 31

jamb 2021

An element having the atomic number 17 will resemble which of the following elements having atomic number as given below?

A33

B35

C18

D19

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Question 32

jamb 2021

The only metal that is anti-bacterial is?

AIron

BSodium

CAlluminium

DCopper

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Question 33

jamb 2021

A solution contains 20g of solute in 180g of solvent. If the solvent is water, what is the concentration of the solution in terms of mass by mass percentage

A11.%

B22.2%

C10%

D20%

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Question 34

jamb 2021

The nucleus of an atom consists of?

AElectrons and neutrons

BElectrons and protons

CProtons and neutrons

DNone of the above

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Question 35

jamb 2021

The metal used to recover copper from a solution of copper sulphate is?

ANa

BAg

CHg

DFe

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Question 36

jamb 2021

The nucleus of a hydrogen atom consist of a?

A1 proton only

B1 proton, 2 neutron

C1 neutron only

D1 electron only

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Question 37

jamb 2021

The heat required to raise the temperature of the body by 1k is called?

ASpecific heat

BThermal capacity

CWater equivalent

DNone of the above

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Question 38

jamb 2021

The most abundant rare gas in the atmosphere is?

AHe

BNe

CAr

DXe

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Question 39

jamb 2021

The inherited traits of an organism are controlled by?

ARNA molecules

BNucleotides

CDNA molecules

DEnzymes

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Question 40

jamb 2021

220g of carbon dioxide contains ----- moles

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Question 41

jamb 2021

The mass of one Avogadro number of helium atoms is?

A1.00gram

B4.00gram

C8.00gram

D6.00gram

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Question 42

jamb 2021

The mass number of a nucleus is?

AAlways less than its atomic number

BThe sum of the number of protons and neutrons present in the nucleus

CAlways more than the atomic weight

DA fraction

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Question 43

jamb 2021

The reactivity of fluorine is due to?

Aits high electro negativity

Bsmall size of fluorine atom

Cavailability of D-orbitals

Dstrong f-f bond

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Question 44

jamb 2021

Soaps clean surfaces on the principle based on?

Aviscosity

Bfloatation

Celasticity

Dsurface tension

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Question 45

jamb 2021

Which of the following is a form of calcium carbonate?

I. limestone
II. marble
III. chalk
Iv. egg-shells

AI only

BI, II and IV

CI and II only

DI, II, III, and IV

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Question 46

jamb 2021

Neutrons were discovered by?

AJames Chadwick

BErnest Rutherford

CJ.J Thompson

DJohn Dalton

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Question 47

jamb 2021

The maximum electron in N shell is?

C18

D32

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Question 48

jamb 2021

A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?

ASublimation

BEvaporation

CDiffusion

DRadiation

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Question 49

jamb 2021

Oxygen is absent in?

AKerosene

BSoil

CGlass

DCement

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Question 50

jamb 2021

The gas which causes global warming is?

AO\(_{2}\)

BCO\(_{2}\)

CN\(_{2}\)

DHe

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