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.

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

197 questions
Question 1 of 20 197 total questions
Question 51
jamb 2024

The reaction of hydrogen and chlorine to produce hydrogen chloride gas is explosive in 

Adiffused light
Bsunlight
Cinfrared light
DRaman light
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Question 52
jamb 2024

The electronic configuration of an atom of Nitrogen is 1s\(^2\) 2s\(^2\) 2p\(^1_x\) 2p\(^1_y\) 2p\(^1_z\) because the atom is

Ain an excited state
Bundergoing energy changes
Cunstable and ready to combine with another
Dsimply obeying rules governing electron configuration
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Question 53
jamb 2024

The Van der waals forces of attraction operates between

Aatoms
Bcations
Cmolecules
Danions
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Question 54
jamb 2024

If 11.0g of a gas occupies 5.6 dm\(^3\) at s.t.p., calculate its vapour density (1 mole of a gas occupies 22.4 dm\(^3\)).

A22
B44
C66
D88
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Question 55
jamb 2024

Solubility curve is a plot of solubility against 

Atemperature
Bpressure
Cvolume
Dconcentrate
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Question 56
jamb 2024

Nitrogen obtained from air is not absolutely pure because it contains the following except

Aoxygen
Bcarbon (IV)oxide
Cinert gases
Dwater vapour
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Question 57
jamb 2024

The indicator used in a titration between strong acid and weak base is

Amethyl orange
Bphenolphthalein
Cbromothymol blue
Dmethyl red
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Question 58
jamb 2024

A typical chemical reaction will be spontaneous if 

Aenthalpy change is negative
Bfree energy change is greater than one
Centropy change is zero
Denthalpy and free energy change are equal
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Question 59
jamb 2024

Kerosene is used as solvent for 

APaints
BSulphur
CGums
DFats
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Question 60
jamb 2024

The term that is not associated with petroleum industry is ?

ACracking
BSaponification
CPolymerization
DFermentation
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Question 61
jamb 2024

An example of an amphoteric oxide is

AP\(_4\)O\(_{10}\)
BAl\(_2\)O\(_3\)
CCuO
DK\(_2\)O
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Question 62
jamb 2024

The IUPAC nomenclature of the complex K\(_4\)Fe(CN)\(_6\) is

Apotassium hexacyanoferrate(II)
Bpotassium hexacyanoferrate(III)
Cpotassium hexacyanoferrate(IV)
Dpotassium hexacyanoferrate(VI)
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Question 63
jamb 2024

Hydrochloric acid is regarded as a strong acid because it

Aionizes partially
Bionizes completely
Cis a mineral acid
Dreacts with a base
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Question 64
jamb 2024

When a specie undergoes oxidation, its

Aoxidation number increases
Boxidation number decreases
Coxidation number remains constant
Dacts as oxidizing agent
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Question 65
jamb 2024

An example of a substance that does not change directly from solid to gas when heated is

ANH\(_4\)Cl\((_s\))
BI\(_2\)\((_s\))
CCaCO\(_3\) \((_s\))
DS\(_8\) \((_s\))
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Question 66
jamb 2024

\(^{14}_7\)N  + X → \(^{14}_6\)C  +  \(^1_1\)P

In the reaction above, X is 

Aa proton
Ban alpha particle
Ca beta particle
Da neutron
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Question 67
jamb 2024

The substance that reacts with sodium to form alkali and changes white anhydrous copper(II) tetraoxosulphate (VI) to blue is

Abase
Bacid
Cwater
Dsolvent
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Question 68
jamb 2024

A major effect of oil pollution in coastal water is 

Adestruction of aquatic life
Bnitrification of the water body
Cdetoxification of water
Ddisinfection of the water body
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Question 69
jamb 2024

The combustion of candle under limited supply of air forms

Awater and CO\(_2\)
Bwater and CO
Csoot and CO
Dsoot and CO\(_2\)
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Question 70
jamb 2024

In the treatment of water for municipal supply, chlorine is used to 

Aprevent tooth decay
Bprevent goitre
Ckill germs
Dremove colour or odour
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