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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.

90 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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Past Questions

90 questions

Question 1 of 20 90 total questions

Question 1

waec 2014

The oxide from electric power station is

Acarbon (IV) oxide

Bcopper (ll) oxide

Cnitrogen (IV) oxide

Dsulphur (IV) oxide

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Question 2

waec 2014

The most common process in the extraction of metals from their ore is

Acatalysis

Belectrolysis

Coxidation

Dreduction

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Question 3

waec 2014

Which of the following gases is used to retard the vaporization of the filament in a light bulb?

AArgon

BHelium

CHydrogen

DOxygen

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Question 4

waec 2014

The purity of a solid sample can best be determined by its?

Aboiling point

Bmelting point

Cconductivity

Dsolubility

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Question 5

waec 2014

The production of biogas from the fermentation of waste materials is an example of

Acombustion

Bincineration

Crefining

Drecycling

View Explanation & Discuss

Question 6

waec 2014

Which of the following organic compounds could be represented by the empirical formula CH₂O?

AEthanal

BEthane

CEthanol

DEthanoic acid

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Question 7

waec 2014

Consider the reaction represented by the following equation: C₂H_4(g)
+ 30_2(g) → 2CO_2(g) + 2H₂O_(g)How many moles of ethene would be burnt to produce 0.1 mole of water?

A0.05 mole

B0.10 mole

C0.20 mole

D2.00 moles

View Explanation & Discuss

Question 8

waec 2014

The liquid hydrocarbon likely to be found in the fraction of crude oil used for domestic cooking is?

AC₃H₈

BC ₅H ₁₂

CC₁₃H₂₈

DC₂₀H₄₂

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Question 9

waec 2014

A colourless hydrocarbon with a sweet smell undergoes substitution reaction. The hydrocarbon is likely to be

Aalkanol

Bbenzene

Cester

Dmethane

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Question 10

waec 2014

The enzyme that catalyses the conversion of glucose te ethanol and carbon (IV) oxide is

Adiastase

Bmaltase

Cptyalin

Dzymase

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Question 11

waec 2014

The IUPAC name of the following organic compound is HOOC - COOH

Aethan - 1, 2 -dioc acid

Bethanoic acid

Coxalic acid

Dpropan - 1,2-dioic acid

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Question 12

waec 2014

Which type of reaction is illustrated by the following equation? C₁₂H₂₆ → 5C ₂H₄ + C ₂H₆

AAddition

BCracking

CHydrogenation

DPolymerization

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Question 13

waec 2014

Which of the following compounds determines the octane rating of petrol?

A1,2,3 - trimethyl pentane

B2,3,5 - trimethyl octane

C2,3,5 - trimethyl pentane

D2,2,4 - trimethyl pentane

View Explanation & Discuss

Question 14

waec 2014

Ethene molecules can be added to one another to form a long chain compound called a

Adimer

Bmonomer

Cpolymer

Dtrimer

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Question 15

waec 2014

Reduction is the process of

Aloss of electron

Bloss of hydrogen

Closs of oxygen

Daddition of electronegative elements

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Question 16

waec 2014

The reaction that occurs all the anode when CuSO_4(aq) is electrolyzed using carbon electrode is

A2H ^- _(aq) + 2e → H _2(g)

BCu²⁺ _(aq) + 2e → Cu _(s)

C4OH _(aq) _-4e → 2H₂O_(l) + O2 _(g)

DSO_4(aq)² _-2e → SO _2(g) + O_2(g)

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Question 17

waec 2014

Consider the reaction represented by the following equation: N_2(g) + 3H_2(g) ⇌ 2NH_{3(g)_{; ∆H^ϴ = -xkJ mol^-1. Which of the following conditions would increase the yield of NH₃?}}

AAddition of iron catalyst

BIncrease in the temperature of the system

CIncrease in the volume occupied by reactants

DIncrease in the total pressure of the system

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Question 18

waec 2014

Which of the following factors would affect the equilibrium constant?

AConcentration

BTemperature

CPressure

DVolume

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Question 19

waec 2014

Consider the reaction represented by the following equation: Na₂CO_3(aq) + 2HCl_(aq) \(\longrightarrow\) 2NaCl_(aq) + H₂O_(l) + CO_2(g) . What volume of 0.02 mol dm^-3 Na₂CO_3(aq) would be required to completely neutralize 40 cm³ of 0.10 mol dm^-3 HCl_(aq)?

A200 cm³

B100 cm³

C40 cm³

D20 cm³

View Explanation & Discuss

Question 20

waec 2014

Which of the following salts on hydrolysis would give an alkaline solution?

ANH₄CI_(s)

BAICI_3(s)

CCH₃COONa_(s)

DNH₄NO_3(s)

View Explanation & Discuss

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