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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.

50 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

50 questions

Question 1 of 20 50 total questions

Question 1

jamb 1992

The nucleus of the isotopes tritium,contains

Atwo neutrons with no protons

Bone neutron and one proton

Ctwo neutrons and one proton

Dtwo neutrons, one proton and one electron

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Question 2

jamb 1992

A given mass of gas occupies 2 dm² at 300k. At what temperature will its volume be doubled keeping the pressure constant?

A400k

B480k

C550k

D600k

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Question 3

jamb 1992

Which of the following compounds is a secondary alkanol?

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Question 4

jamb 1992

In the experiment above. Z can be

Aa solution of sodium dioxonitrate (lll) and ammonium chloride

Ba solution of lead trioxnitrate (V)

Ca solution of sodium trioxonitrate (V) and ammonium chloride

Dconcentrated tetraoxosulphate (VI) acid and sodium trioxonitrate (V)

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Question 5

jamb 1992

An example of a polysaccharides is?

A—dextrose

Bmannose

Cglucose

Dstarch

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Question 6

jamb 1992

Alkanals can be differentiated from alkanones by reaction with?

A2,4-dinitrophenylhydrazine

Bhydrogen cyanide

Csodium hydrogen sulphite

DTollen's reagent

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Question 7

jamb 1992

The characteristics reaction of carbonyl compounds is?

Asubstitution

Belimination

Caddition

Dsaponfication

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Question 8

jamb 1992

An organic compound containing 40.1% carbon and 6.6% hydrogen has an empirical formula of?

AC₂H₄O₂

BC₂H₃O₂

CCH₂O

DCH₃O

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Question 9

jamb 1992

The functional group present in an organic compound which gives bubbles on treatment with a saturated solution of NaHCO₃ is?

Ahydroxyl group

Bcarboalkoxyl group

Ccarbonyl group

Dcarboxyl group

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Question 10

jamb 1992

Which of the following are isomers?

AEthanol and dimethyl ether

BBenzene and methybenzene

CEthanol and propanone

DTrichloromethane and tetrachloromethane

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Question 11

jamb 1992

Which of the following compounds reacts with sodium metal as well as silver and copper salts ?

ACH₃C Ξ C—CH₃

BCH₃CH₂CH₂

CCH₃C Ξ CH

DCH₃CH = CH CH₃

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Question 12

jamb 1992

The carbon atoms in ethene are?

Asp³ hybridized

Bsp hybridized

Csp² hybridized

Dnot hybridized

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Question 13

jamb 1992

CaO_s + H₂O_(l) → Ca(OH)₂_(s) ΔH -65 kj. The process represented by the above equation is known as?

Adissolution

Bslaking

Climing

Dmortaring

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Question 14

jamb 1992

Duralumin consists of aluminium, copper, ?

Azinc and gold

Blead and maganese

Cnickle and silver

Dmanganese and magnesium

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Question 15

jamb 1992

Which of the following is NOT used as a raw material in the Solvay process?

AAmmonia

BSodium chloride

CCalcium trioxocarbonate (IV)

DSodium trioxocarbonate (IV)

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Question 16

jamb 1992

Sodium hydroxide solution can be conveniently stored in a container made of?

Alead

Bzinc

Caluminium

Dcopper

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Question 17

jamb 1992

Addition of an aqueous solution of a salt gives a white precipitate. The salt is likely to be a?

Anitrate

Bcarbonate

Cchloride

Dsulphide

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Question 18

jamb 1992

Safety matches contain sulphur and the following except?

Asodium chloride

Bpotassium trioxonitrate (V)

Ccharcoal

Dphosphorus sulphide

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Question 19

jamb 1992

The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?

Ahydrogen

Bnitrogen (IV) oxide

Coxygen

Dammonia

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Question 20

jamb 1992

The gas formed when ammonium trioxonitrate (V) is heated with sodium hydroxide is?

Ahydrogen

Bnitrogen (IV) oxide

Coxygen

Dammonium

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