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.

159 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

159 questions
Question 1 of 20 159 total questions
Question 41
jamb 2025

Atom with the electron configuration of 1S\(^2\)2S\(^2\)2P\(^6\)3S\(^2\) belongs to

AGroup 3 and Period 2
BGroup 8 and Period 3
CGroup 2 and Period 3
DGroup 2 and Period 6
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Question 42
jamb 2025

The metal that will liberate H\(_2\) gas from dilute HNO\(_3\) is

ACu
BMg
CCa
DZn
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Question 43
jamb 2025

The use of CFCs as a blowing agent has application in

Afoam industry
Btyre industry
Crefrigerant
Dpropellant
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Question 44
jamb 2025

Sodium in the above reaction is produced by 

ABrowning process
BChlor process
CDowns process
DBosch process
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Question 45
jamb 2025

2SO\(_2\)\(_{(s)}\)  +  O\(_2\)\(_{(s)}\) ⇌  2SO\(_3\) ; ΔG° = - ve

For the above reaction to be feasible

AΔH = + ve ,ΔS = + ve
BΔH = 0 ,ΔS = + ve
CΔH = + ve ,ΔS = - ve
DΔS = 0
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Question 46
jamb 2025

A by-product of the alkaline hydrolysis of tristearin is a

Adihydric alkanol
Btertiary alkanol
Csecondary alkanol
Dtrihydric alkanol
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Question 47
jamb 2025

The catalytic hydrogenation of benzene produces

Ahexane
Bmargarine
Chexene
Dcyclohexane
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Question 48
jamb 2025

The process employed in the industrial preparation of tetraoxosulphate(VI) acid is

AContact
BBosch
CFrasch
DHaber
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Question 49
jamb 2025

Gold does not require extraction because it is

Aa precious mineral
Binert
Cfree in nature
Dneutral
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Question 50
jamb 2025

Enzymatic conversion of glucose to ethanol is

Apolymerization
Bhydrogenation
Cfermentation
Dsaponification
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Question 51
jamb 2025

The basicity of  C\(_2\)H\(_2\)O\(_4\) is 

A3
B4
C2
D8
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Question 52
jamb 2025

The expression above represents

AAvogadro's law
BBoyle's law
CGeneral gas law
DCharles' law
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Question 53
jamb 2025

The metal used as a packaging material is

AAl
BCu
CFe
DNa
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Question 54
jamb 2025

The evaluation of petrol from crude oil before it is put on sale is to prevent

Apinking
Breforming
Cpyrolysis
Dcracking
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Question 55
jamb 2025

If 5g of Iron filling was reacted with excess dilute H\(_2\)SO\(_4\) to evolve hydrogen gas, which came to completion after 10 min, calculate the rate of reaction in g/hr.

A5
B30
C20
D10
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Question 56
jamb 2025

The IUPAC nomenclature of the compound above is

Apropyl ethanoate
Bethyl ethanoate
Cethyl propanoate
Dpropyl methanoate
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Question 57
jamb 2025

If there is no change in volume in a gaseous reaction, the pressure will

Afavour forward reaction
Bfavour backward reaction
Chave no effect on equilibrium position
Dhave effect on equilibrium position
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Question 58
jamb 2025

The source of carbon(II)oxide that acts as air pollutant is

Aphotochemical smog
Brespiration
Ccombustion of fuel
Ddecomposition of sewage
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Question 59
jamb 2025

The process that illustrates reformation of petroleum product is

Ahexene to hexane
Bcyclohexane to benzene
Chexane to carbon(IV)oxide and water vapour
Dhexane to butane and ethane
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Question 60
jamb 2025

The liquid state of water at room temperature is as a result of

Aelectrovalent bond
Bcovalent bond
Cvan der waals forces
Dhydrogen bond
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