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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.

81 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10
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Past Questions

81 questions
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Question 1 of 20 81 total questions
Question 11
waec 1988

The following are uses of radioactive isotopes except for

Asterilization of medical equipment
Btracing reaction paths
Cdating elements
Dradiography
Edetermining equilibrum positions
View Explanation & Discuss
Question 12
waec 1988
Which of the following statements is not correct?
ACarbon exhibits allotropy
BSulphur exhibits allotropy
CChlorine exhibits allotopy
DNitrogen is a gas
EArgon is a noble gas
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Question 13
waec 1988
Which of the following is a neutral oxide?
ANitrogen (IV0 oxide
BCarbon (IV) oxide
CSulphur (IV) oxide
DPhodphoorus (IV) oxide
ENitrogen oxide
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Question 14
waec 1988
Which of the following types of hybridization gives rise to tetrahedral molecules?
Asp
Bsp2
Csp3
Dsp3d
Esp3d2
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Question 15
waec 1988
Which of the following is used as an anaesthetic?
ACHI3
BCHCI3
CCH3OH
DC2H5OH
ECHBr3
View Explanation & Discuss
Question 16
waec 1988
Detergents are better than soaps for laundry because
Adetergents are synthetic while soaps are not
Bdetergents are more soluble in water than soaps
Cscum is precipitated when soaps are used with hard water but not with stergents
Dsoaps from soluble saits with ions causing hardness of water while detergents do not
Esoaps are in bars while detergents are in powder form
View Explanation & Discuss
Question 17
waec 1988

A salt which loses mass when exposed to air is

Ahygroscopic
Bdeliquescent
Cefflorescent
Dfluorescent
Eeffervescent
View Explanation & Discuss
Question 18
waec 1988
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
ACH2
BCH3
CC2H2
DC2H4
EC2H6
View Explanation & Discuss
Question 19
waec 1988

Given that 32.0g sulphur contains 6.02 x 10 23 sulphur atoms how many atoms are there in 2.70g of aluminium? {Al = 27, S =32}

A6.02 x 10 23
B3.01 x 1022
C6.02 x 1022
D5. 08 x 1022
E3.01 x 1022
View Explanation & Discuss
Question 20
waec 1988
Which of the following does not affect the rate of a chemical reaction?
AAddition or presence of a catalyst
BSize of the reacting particles
CThe enthalpy change for the reaction
DConcentration of the reactants
ETemperatureat which the reaction is carried out
View Explanation & Discuss
Question 21
waec 1988
Which of the following does not affect the rate of a chemical reaction?
AAddition or presence of a catalyst
BSize of the reacting particles
CThe enthalpy change for the reaction
DConcentration of the reactants
ETemperatureat which the reaction is carried out
View Explanation & Discuss
Question 22
waec 1988
Which of the following compound is aromatic?
ABenzene
BCyclobutane
CCyclopentane
DHexane
EEthene
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Question 23
waec 1988
The reaction represented by the equation NaOH(aq) + HCI(aq) → NaCI(aq) + H2O(/)
Ais a double decomposition
Bis a neutralization
Cis reversible
Dis usually catalysed
Eattains equilibrium after a few seconds
View Explanation & Discuss
Question 24
waec 1988
The following are uses of sulphur except
Amanufacture of tetraoxosulphate (VI) acid
Bprevention of the growth of fungi
Cvulcanization rubber
Dmanufacture of dyes
Ecoating of steel to prevent rusting
View Explanation & Discuss
Question 25
waec 1988
An acid present in proteins is
Alactic acid
Bamino acid
Cpropanoic acid
Dpalmitic acid
Estearic acid
View Explanation & Discuss
Question 26
waec 1988
Equilibrium is said to be attained in reversible reaction when
Aall the reactants have been used up
Ball the products have been formed
Cthere is no further change in temperature
Dthe rates of the forward and backward reactions are equal
Ethe rate of formation of the products decreases with time
View Explanation & Discuss
Question 27
jamb 1988
The acidic hydrogen in the compound is the hydrogen attached to carbon number
A5
B4
C3
D1
View Explanation & Discuss
Question 28
jamb 1988

Carbon (ll) oxide may be collected as shown above because 

Ais heavier than air
Bis less dense than air
Cis insoluble in water
Dburns in oxygen to form carbon (IV) oxide
View Explanation & Discuss
Question 29
jamb 1988
The IUPAC name for
A2-methylbutanoic acid
B2-methyl-1- hydroxyketone
C2-methyl-1-hydroxy aldehyde
D2-methylpentanoic acid
View Explanation & Discuss
Question 30
jamb 1988

The diagram above shows the reaction path of an exothermic reaction. The heat of reaction is represented by

Al
Bll
Clll
DlV
View Explanation & Discuss
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