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.

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Past Questions

2,505 questions
Question 1 of 20 2,505 total questions
Question 51
jamb 2025

The acid used in making baking soda and soft drink is

Atartaric acid
Bfatty acid
Cboric acid
Dcitric acid
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Question 52
jamb 2025

Calculate the pH of 0.001M  KOH solution.

A11
B14
C12
D3
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Question 53
jamb 2025

When ΔH is positive and small, and ΔS is positive and large, the reaction will be

ANon-spontaneous
Bfavour forward reaction only
Cfavour backward reaction only
Dspontaneous
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Question 54
jamb 2025

The property of metal that makes it suitable as a catalyst is

Afilled f-orbital
Bpartially filled d-orbitals
Cpartially filled f-orbital
Dfilled d-orbital
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Question 55
jamb 2025

The dusty and sand particles present in the air is an example of 

Aa suspension
Ba dispersion
Can emulsion
Da saturated solution
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Question 56
jamb 2025

An example of an alkaline gas is

AHCl
BN\(_2\)
CNH\(_3\)
DNO\(_2\)
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Question 57
jamb 2025

In the table above, the two compounds that will combine in the presence of an acid-catalyzed compound, V is

AI and IV
BIII and IV
CI and II
DII and III
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Question 58
jamb 2025

The composition of petroleum varies because it is a 

Ahydrocarbon
Bliquid
Cmixture
Dnatural resource
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Question 59
jamb 2025

The molecule with the highest number of lone pair of electrons is 

AH\(_2\)O
BNH\(_3\)
CCH\(_4\)
DC0\(_2\)
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Question 60
jamb 2024

                    H\(_2\)SO\(_4\)

C\(_2\)H\(_5\)OH      →         C\(_2\)H\(_4\)

                    170\(^0\)C

The reaction above illustrates 

Aoxidation
Besterification
Cdehydration
Dpolymerization
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Question 61
jamb 2024

The IUPAC Nomenclature of CH\(_3\)CH\(_2\)C(CH\(_3\))=C(CH\(_3\))\(_2\) for the compound is

A2,3-dimethylpentene
B2,3-dimethylpent-2-ene
C3,4-dimethylpent-3-ene
D3,4-dimethylpentene
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Question 62
jamb 2024

Esterification reaction is analogous to

Aoxidation reaction
Bneutralization reaction
Ccondensation reaction
Dhydrolysis reaction
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Question 63
jamb 2024

When the subsidiary quantum numbers (l) equals 1, the shape of the orbital is 

Aspherical
Bdumb-bell
Cflat
Dround
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Question 64
jamb 2024

What is the vapour density of 560cm\(^3\) of a gas that weighs 0.4g at s.t.p?

[Molar Volume of gas at s.t.p = 22.4 dm\(^3\) ]

A6.0
B8.0
C16.0
D32.0
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Question 65
jamb 2024

Boyle's law can be expressed mathematically as

APV = K
BPV = RT
CV =KT
D\(\frac{V}{T}\) = K
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Question 66
jamb 2024

The percentage of carbon(IV) oxide in air is

A0.01
B0.02
C0.05
D0.03
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Question 67
jamb 2024

The shape of ammonia molecule is

AV-Shaped or bent
BTetrahedral
Cco-plannar
Dtrigonal
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Question 68
jamb 2024

The IUPAC name of the compound above is

A3-methyl, 3-bromo butane
B2-methyl, 2-bromo butane
C2-bromo, 2-methyl butane
D3-bromo, 3-methyl butane
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Question 69
jamb 2024

Heat of solution involves two steps that is accompanied by heat change. The energies involved in this steps are

Alattice energy and hydration energy
Blattice energy and ionic energy
CHeat energy and lattice energy
Dhydration energy and heat energy
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Question 70
jamb 2024

The amount of water a substance chemically combined with is called water of

Adehydration
Bsolution
Chydration
Dcrystallization
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