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.

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

137 questions
Question 1 of 20 137 total questions
Question 41
jamb 2024

A gas that turns lime water milky is likely to be from

ATrioxocarbonate(IV)
BChloride
CTrioxonitrate(V)
DTetraoxosulphate(VI)
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Question 42
jamb 2024

Rust on the surface of a metal sheet contains

Ahydrated iron(II)oxide
Bhydrated iron(III)oxide
Ciron(III)hydroxide
Diron(III) trioxocarbonate(IV)
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Question 43
jamb 2024

The element which can combine with oxygen to form an acid anhydride of the form XO\(_2\) is

Aphosphorus
BChlorine
Cfluorine
Dsulphur
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Question 44
jamb 2024

In contact process, the catalyst used in the conversion of sulphur(IV)oxide to sulphur(VI) oxide is 

Anickel
Bplatinum
Cvanadium(V)oxide
Dmagnesium(IV)oxide
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Question 45
jamb 2024

A factor that does not affect the rate of a chemical reaction is

Asurface area
Btemperature
Cvolume
Dcatalyst
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Question 46
jamb 2024

Concentrated sodium chloride solution is electrolyzed using mercury cathode and graphite anode. The products at the anode and the cathode respectively are

Ahydrogen and chlorine
Bchlorine and hydrogen
Cchlorine and sodium
Dsodium and chlorine
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Question 47
jamb 2024

What is formed when metal reacts with acid to liberate gas?

ASalt
BBase
CAcid
DLiquid
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Question 48
jamb 2024

The IUPAC nomenclature of the compound above is

Apropan-1-ol
Bbutan-1-ol
C2-methyl propan-1-ol
D2-methyl propan-2-ol
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Question 49
jamb 2024

Aqueous solution of sodium hydroxide can be used to test for the presence of : I. Ca\(^{2+}\) ,   II. Zn\(^{2+}\) ,  III. Cu\(^{2+}\)

AI only
BI and III
CI, II and III
DI and II only
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Question 50
jamb 2024

The composition of alloy permalloy is iron and

Acopper
Bnickel
Clead
Dmagnesium
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Question 51
jamb 2024

CH\(_3\)-CH\(_2\)-OH and CH\(_3\)-O-CH\(_3\)

The relationship between the two compounds above, is that they are 

Aallotropes
Bisotopes
Cisomers
Disobars
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Question 52
jamb 2024

Alkanoates are naturally found in

Alipids
Bvitamins
Cproteins
Drubbers
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Question 53
jamb 2024

Determine the half-life of a first order reaction with constant 4.5 x 10\(^{-3}\) sec\(^{-1}\).

A154 s
B15.4 s
C1540 s
D1.54 s
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Question 54
jamb 2024

Fats and oils are esters of fatty organic acids combined with a trihydric alkanol commonly referred to as 

Aethanol
Bmethanol
Cglycol
Dglycerol
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Question 55
jamb 2024
COMPOUND S T U V W
FORMULA ROR' RCOOH' RCOR' ROH' RCOOR'

From the table above, which of these two compounds can form functional group isomers?

AS and T
BT and U
CS and V
DT and V
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Question 56
jamb 2024

The difference in molecular mass between an alkene and alkyne with six carbon per mole is

A10
B12
C2
D14
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Question 57
jamb 2024

The molecular formular of a hydrocarbon with an empirical formula of CH\(_3\)  and a molar mass of 30 is 

AC\(_2\)H\(_4\)
BC\(_3\)H\(_3\)
CC\(_2\)H\(_6\)
DC\(_6\)H\(_6\)
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Question 58
jamb 2024

Sulphur(IV)oxide can be used as a

Acoating agent
Bdehydrating agent
Crefrigerant
Ddrying agent
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Question 59
jamb 2024

Water gas obtained from the gasification of coke is made up of 

ANitrogen and Carbon(II) oxide
BNitrogen and Hydrogen
CHydrogen and Carbon(II) oxide
DCarbon(II)oxide and Carbon(IV)oxide
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Question 60
jamb 2024

When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from 

Ablue to green
Bpink to yellow
Cpurple to colourless
DOrange to green
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