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Chemistry Past Questions

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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 2001

Use the solubility curves below to answer the question. If 1 dm\(^3\) of a saturated solution of L at 60\(^0\)C is cooled to 25\(^0\)C, what amount in mole will separate out?

A0.75

B0.25

C1.00

D0.50

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Question 2

jamb 2001

The diagram above represents the formation of

Aa metallic bond

Ban electrovalent bond

Ca covalent bond

Da coordinate covalent bond

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Question 3

jamb 2001

Use the graph above to answer this question.How long does it take all the solid to melt?`

A2.5 mins

B6.0 mins

C1.0 min

D3.0 mins

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Question 4

jamb 2001

Use the graph above to answer this question.If the gas is cooled, at what temperature will it start to condense?

A125 ^oC

B150^oC

C175^oC

D250^oC

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Question 5

jamb 2001

Which of the following gases contains the least number of atoms at s.t.p?

A1 mole of butane

B3 mole of ozone

C4 mole of chlorine

D7 mole of argon

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Question 6

jamb 2001

When sodium reacts with water, the resulting solution is

AWeakly acidic

BNeutral

CAcidic

DAlkaline

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Question 7

jamb 2001

\(C_{12}H_{22}O_{11(s)} + H_2SO_{4(aq)} → 12C(s) + 11H_2O(l) + H_2SO_{4(aq)}\)
In the reaction above, tetraoxosulphate (VI) acid function as

AA dehydrating agent

BAn oxidizing agent

CA reducing agent

DA catalyst

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Question 8

jamb 2001

Which of the following represent hybridization in ethyne?

ASp²

BSp²d

CSp³

DSp

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Question 9

jamb 2001

Which of the following metals burn with brick red flame?

APb

BCa

CNa

DMg

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Question 10

jamb 2001

The gas that can best be collected by downward displacement of air is

AChlorine

BSulphur (IV) oxide

CAmmonia

DCarbon (IV) oxide

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Question 11

jamb 2001

A burning candle produces water and

ACarbon (II) oxide

BCarbon (IV) oxide

COxygen

DHydrogen

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Question 12

jamb 2001

The pair of organic compounds that are isomers is

ABenzene and methylbenzene

BTrichloromethane and tetrachloromethane

CEthanol and propane

DBut-1-ene and but-2-ene

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Question 13

jamb 2001

A characteristic reaction of the compounds with the general formula C\(_n\)H\(_{2n}\) is

AEsterification

BPolymerization

CDecarboxylation

DSubstitution

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Question 14

jamb 2001

Proteins in acid solution undergo

APolymerization

BSubstitution

CFermentation

DHydrolysis

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Question 15

jamb 2001

When chlorine Is passed into water and the resulting solution exposed to sunlight, the product formed are

AChlorine gas and hydrogen

BOxygen and oxochlorate (I) acid

CChlorine gas and oxochlorate (I) acid

DHydrochloric acid and oxygen

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Question 16

jamb 2001

A trihydric alkanol is

AGlycerol

BPhenol

CGlycol

DEthanol

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Question 17

jamb 2001

Catalytic hydrogenation of benzene produces

AOil

BCyclohexene

CCyclohexane

DMargarine

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Question 18

jamb 2001

During the vulcanization of rubber, sulphur is added to

ABreak down rubber polymer

BLengthen the chain of rubber

CBind rubber molecules together

DAct as a catalyst

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Question 19

jamb 2001

The main impurity in iron ore during the extraction of iron is

ASilicon (IV) oxide

BCarbon (IV) oxide

CCalcium trioxosilicate

DSulphur (II) oxide

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Question 20

jamb 2001

The general formula for the alkanals is

AROH

BR₂CO

CRCOOR¹

DRCHO

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