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Chemistry Past Questions

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49 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

49 questions

Question 1 of 20 49 total questions

Question 1

jamb 2008

Choose the correct option from the structure above

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Question 2

jamb 2008

Use the diagram to answer this question.The colour of the fountain water is

Ablue

Borange

Cred

Dyellow

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Question 3

jamb 2008

Use the diagram to answer this question. The gas that can be used to demonstrate the experiment is

Ahydrogen chloride

Bhydrogen sulphide

Cnitrogen(ll) oxide

Ddinitrogen (l) oxide

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Question 4

jamb 2008

Detergents are manufactured with straight hydrocarbon chains so as to make them

Asoluble

Bbiodegradable

Ccheaper

Dfoamy

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Question 5

jamb 2008

Polyvinyl chloride is used in the production of

Aglass

Balloy

Cpipes

Dceramics

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Question 6

jamb 2008

The product obtained when a mixture of benzene vapour and hydrogen are passed over nickel catalyst at 180ºC is

Acyclohexane

Bcyclopentane

Cn- hexane

Dn - pentane

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Question 7

jamb 2008

Reduction of alkanones with LialH4 produces

Aprimary alkanols

Bsecondary alkanols

Ctertiary alkanols

Dpolyhydric alkanols

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Question 8

jamb 2008

Reduction of nitroalkanes, nitrites and amides is a route for the preparation of

Aamines

Balkenes

Cpolymers

Ddetergents

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Question 9

jamb 2008

A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into

ACH₂ = CH - CH₂ - CH₃

BCH₃ CH₂ - C ≡ CH

CCH₃ CH₂ CH₂ CH₃

DCH₃ - C C - CH₃

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Question 10

jamb 2008

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular?

AC₂H₂

BC₃H₃

CC₄H₄

DC₅H₅

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Question 11

jamb 2008

The IUPAC nomenclature for the structure above is

A2, 3 - dichloro - 4, 4, 5 - trimethyl pent - 2 - ene

B4, 5 - dichloro - 2, 3 - dimethyl hex - 2 - ene

C2, 3 - dichloro - 4, 4 - dimethyl hex - 2- ene

D2, 3 dichloro - 2, 2 - dimethyl hex - 2 - ene

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Question 12

jamb 2008

If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to

Acarbon

Bcarbon (IV) oxide

Cethene

Dethanol

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Question 13

jamb 2008

If the silver mirror test is positive, it indicates the presence of an

Aalkyne

Balkanol

Calkanone

Dalkanal

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Question 14

jamb 2008

The type of isomerism shown by cis- and trans- isomers is

Aoptical isomerism

Bpositional isomerism

Cfunctional isomerism

Dgeometrical isomerism

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Question 15

jamb 2008

The most common ores of iron include

Ahaematite, malachite and limonite

Bchalcocite, calamine and bornite

Cmagnetite, haematite and limonite

Dmagnetite, chalcocite and bornite

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Question 16

jamb 2008

which of the following gives a precipitate when treated with NaOH solution?

AAlCl₃

BNH₄Cl

CNa₂CO₃

DCH₃COONa

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Question 17

jamb 2008

Leads is used for making bullets and lead shots because of its

Aresistance to corrosion

Blow melting point

Chigh density

Dflexibility

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Question 18

jamb 2008

When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of

ACa²⁺

BNa⁺

CZn²⁺

DK⁺

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Question 19

jamb 2008

Which of the following compounds of trioxonitrate (V) will decompose to give dinitrogen (i) oxide and water when heated?

ANaNO₃

BZn(NO₃)₂

CCu(NO₃)₂

DNH₄NO₃

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Question 20

jamb 2008

The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is

Aoxygen

Bchlorine

Cnitrogen

Dhydrogen

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