Chemistry Past Questions

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Past Questions

2,505 questions
Question 1 of 20 2,505 total questions
Question 11
jamb 2025

An inflated balloon shrinks when placed in a freezer because the 

Avolume of gas increases and expands
Bnumber of gas molecules decreases
Cgas motion reduces and exert less pressure
Dgas molecules completely stop moving
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Question 12
jamb 2025

The constituents of permalloy are Iron and 

ANickel
BTin
CChromium
DCopper
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Question 13
jamb 2025

Magnesium tetraoxosulphate(VI) salt is commonly used as a

Adisinfectant
Bplasticizer
Cfertilizer
Dlaxative
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Question 14
jamb 2025

Anti-freeze used in a vehicle radiator is a mixture of water and

Apropanetriol
Bpropanol
Cpropanone
Dpropanal
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Question 15
jamb 2025

(CH\(_3\))\(_2\)CHCH(OH)CH\(_2\)C(CH\(_3\))\(_3\)

The IUPAC name of the compound above is

A2,5,5-trimethylhexan-3-ol
B1,1-dimethylisopentanol
C1,1,4,4-pentamethylbutanol
D2,5-dimethylhexan-4-ol
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Question 16
jamb 2025

In oxidation reactions, electrons are

Ahydrolysed
Bremoved
Cadded
Dhydrated
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Question 17
jamb 2025

What is the function of concentrated H\(_2\)SO\(_4\)?

AIt reacts with metals to give a salt and hydro gas
BIt is a dehydrating agent
CIt neutralizes alkali
DIt produces a cryolite precipitate with basic solution
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Question 18
jamb 2025

Calculate the time required to liberate 9g of Aluminium metal, when a current of 18A is passed through it.

(1F = 96500C , Al = 27)

A1769.17 minutes
B89.34 minutes
C5360.58 minutes
D29.48 minutes
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Question 19
jamb 2025

Commercial deodorant is an example of a colloid called

Aaerosol
Bsol
Cfoam
Demulsion
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Question 20
jamb 2025

The relative molecular mass of an alkanoic acid with the empirical formula of CH\(_2\)O is

[ H = 1, C = 12, O = 16 ]

A46
B88
C60
D72
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Question 21
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 22
jamb 2025

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

ACu
BMg
CCa
DZn
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Question 23
jamb 2025

The use of CFCs as a blowing agent has application in

Afoam industry
Btyre industry
Crefrigerant
Dpropellant
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Question 24
jamb 2025

Sodium in the above reaction is produced by 

ABrowning process
BChlor process
CDowns process
DBosch process
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Question 25
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 26
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 27
jamb 2025

The catalytic hydrogenation of benzene produces

Ahexane
Bmargarine
Chexene
Dcyclohexane
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Question 28
jamb 2025

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

AContact
BBosch
CFrasch
DHaber
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Question 29
jamb 2025

Gold does not require extraction because it is

Aa precious mineral
Binert
Cfree in nature
Dneutral
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Question 30
jamb 2025

Enzymatic conversion of glucose to ethanol is

Apolymerization
Bhydrogenation
Cfermentation
Dsaponification
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