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Chemistry Past Questions

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2,505 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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2,505 questions

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Question 81

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 82

jamb 2024

The Van der waals forces of attraction operates between

Aatoms

Bcations

Cmolecules

Danions

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Question 83

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 84

jamb 2024

Solubility curve is a plot of solubility against

Atemperature

Bpressure

Cvolume

Dconcentrate

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Question 85

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 86

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 87

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 88

jamb 2024

Kerosene is used as solvent for

APaints

BSulphur

CGums

DFats

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Question 89

jamb 2024

The term that is not associated with petroleum industry is ?

ACracking

BSaponification

CPolymerization

DFermentation

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Question 90

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 91

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 92

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 93

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 94

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 95

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 96

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 97

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 98

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\(_2\)

View Explanation & Discuss

Question 99

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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Question 100

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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