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Chemistry Past Questions

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47 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

47 questions

Question 1 of 20 47 total questions

Question 1

waec 2013

Which of the following statements about thermoplastic material is correct? They

Ado not melt on heating

Bharden on heating

Cdecompose on heating

Dsoften and melt on heating

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Question 2

waec 2013

Bronze is a mixture of

ACu and Mg

BCu and Sn

CCu and Zn

DCu and Pb

View Explanation & Discuss

Question 3

waec 2013

Which of the following materials is classified as a non-biodegradable pollutant?

AAnimal hide

BPaper

CPlastic

DWood

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Question 4

waec 2013

Which of the following statements about fine chemical is correct? It

Ais injurious to health

Bhas low degree of purity

Cis produced in relatively small amount

Dcan be stored for a long time

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Question 5

waec 2013

Which of the following raw materials is used in a plastic industry?

AEthene

BMethane

CCalcium

DHydrogen

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Question 6

waec 2013

The main function of limestone in the blast furnace is to

Aact as catalyst

Bact as reducing agent

Cremove impurity

Dsupply carbon (IV) oxide

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Question 7

waec 2013

A hydrocarbon compound contains 92.3% carbon Determine its empirical formula [H = 1.00; C = 12.0]

ACH

BCH_2-

CCH₃

DC₃H₂

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Question 8

waec 2013

Which of the following reactions is common to all hydrocarbones?

ACombustion

BAddition

CPolymerization

DCondensation

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Question 9

waec 2013

How many isomers has C\(_3\)H\(_6\)CI\(_2\)?

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Question 10

waec 2013

Which of the following organic compounds would decolourize bromie water?

ABenzene

BCyclobutane

CHexane

DPentane

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Question 11

waec 2013

The major product formed by the reaction between ethanoic acid and aqueous sodium hydroxide is

Asoap

Bsodium ethanoate

Csodium methoxide

Dwater

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Question 12

waec 2013

The separation of petroleum fractions depends on the differences in their

Amelting points

Bmolar masses

Csolubilities

Dboiling points

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Question 13

waec 2013

Consider the redox reaction as represented by the following equation: 1_2(aq) + 2S₂O₃^2-_(aq) → 21^-_(aq) + S₄O₆^2-_(aq). Which of the species in the equation is reduced?

AS₄O₆^2-_(aq)

BS₄O₃^2-_(aq)

C1_2(aq)

D1^-_(aq)

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Question 14

waec 2013

Which of the following cells produce electrical energy from chemical reactions?
l. Lead-acid battery ll. Dry cell III. Deniell cell IV Electrolytic cell

Al and ll only

Bl, ll, and III only

Clll and IV only

DI and III only

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Question 15

waec 2013

Consider the reaction represented by the equation: N\(_2\)O\(_4\)(g) ⇌ 2NO\(_2\)(g) ; ∆H = + x kJmol-1
What happens when the temperature is reduced at equilibrium?

AConcentration of N ₂O_4(g) decreases

BConcentration of N ₂O_4(g) increases.

CPressure exerted by the gases increases

DPressure exerted by the gases remains constant

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Question 16

waec 2013

The following factors affect the solubility of a solid in a given solvent except

Anature of solute

Bnature of solvent

Cpressure

Dtemperature

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Question 17

waec 2013

A substance is said to be impure if

Aits melting point range is wide

Bit dissolves in water with difficult

Cit has a low melting point

Dit is coloured

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Question 18

waec 2013

Which of the following compounds crystallizes without water of crystallization?

AMgSO₄

BNa₂CO₃

CNaCI

DFeSO₄

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Question 19

waec 2013

Which of the following acids would readily react with CaCO3 to liberate CO2?

ACH₃COOH

BH₂SO₄

CH₂SO₃

DHNO₃

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Question 20

waec 2013

The aqueous solution which has pH > 7 is

AFeCI_3(aq)

BCuSO_4(aq)

CKNO_3(aq)

DNa₂CO_3(aq)

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