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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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197 questions

Question 1 of 20 197 total questions

Question 61

jamb 2024

The scientist that performed the experiment on discharged tubes that led to the discovery of the cathode rays as a sub-atomic particle is

AJ.J Thomson

BRobert Millikan

CErnest Rutherford

DNiels Bohr

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Question 62

jamb 2024

Determine the empirical formula of an oxide of sulphur containing 60% of oxygen

[S = 32, O = 16 ]

ASO\(_3\)

BSO\(_2\)

CSO\(_4\)

DSO

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Question 63

jamb 2024

Fog is a colloid in which

Aliquid particles is dispersed in a gas medium

Bgas particles dispersed in a liquid medium

Csolid particles dispersed in a gas medium

Dgas particles dispersed in a solid medium

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Question 64

jamb 2024

The volume in cm\(^3\) of a 0.12 moldm\(^{-3}\) HCl required to completely neutralize a 20cm\(^3\) of 0.20 moldm\(^{-3}\) of NaOH is

A12.00

B0.0012

C33.33

D2.40

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Question 65

jamb 2024

Which of the following is an air pollutant?

AO\(_2\)

BCO

CH\(_2\)O\((_g\))

DO\(_3\)

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Question 66

jamb 2024

Calculate the mass of Magnesium that will be liberated from its salt by the same quantity of electricity that liberated 16.0 g of Silver.

[Mg = 24.0, Ag = 108 ]

A3.65 g

B3.56 g

C1.87 g

D1.78 g

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Question 67

jamb 2024

\(^{238}_{92}\)U + \(^1_0\)n → \(^{239}_{92}\)U

The process above produces

Aatomic mutation

Ba radioactive isotope

Cother neutrons

Dradiations

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Question 68

jamb 2024

The shape of the molecule of Carbon(IV) oxide is

Atetrahedral

Bpyramidal

Cplannar

Dlinear

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Question 69

jamb 2024

The salt formed when strong acid reacts with strong base is

Anormal

Bdouble

Ccomplex

Dbasic

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Question 70

jamb 2024

When n = 3, the quantum number of an element is

C18

D21

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Question 71

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 72

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 73

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 74

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 75

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 76

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 77

jamb 2024

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

ASalt

BBase

CAcid

DLiquid

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Question 78

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 79

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 80

jamb 2024

The composition of alloy permalloy is iron and

Acopper

Bnickel

Clead

Dmagnesium

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