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.

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

109 questions
Question 1 of 20 109 total questions
Question 21
jamb 2025

The basicity of  C\(_2\)H\(_2\)O\(_4\) is 

A3
B4
C2
D8
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Question 22
jamb 2025

The expression above represents

AAvogadro's law
BBoyle's law
CGeneral gas law
DCharles' law
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Question 23
jamb 2025

The metal used as a packaging material is

AAl
BCu
CFe
DNa
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Question 24
jamb 2025

The evaluation of petrol from crude oil before it is put on sale is to prevent

Apinking
Breforming
Cpyrolysis
Dcracking
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Question 25
jamb 2025

If 5g of Iron filling was reacted with excess dilute H\(_2\)SO\(_4\) to evolve hydrogen gas, which came to completion after 10 min, calculate the rate of reaction in g/hr.

A5
B30
C20
D10
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Question 26
jamb 2025

The IUPAC nomenclature of the compound above is

Apropyl ethanoate
Bethyl ethanoate
Cethyl propanoate
Dpropyl methanoate
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Question 27
jamb 2025

If there is no change in volume in a gaseous reaction, the pressure will

Afavour forward reaction
Bfavour backward reaction
Chave no effect on equilibrium position
Dhave effect on equilibrium position
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Question 28
jamb 2025

The source of carbon(II)oxide that acts as air pollutant is

Aphotochemical smog
Brespiration
Ccombustion of fuel
Ddecomposition of sewage
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Question 29
jamb 2025

The process that illustrates reformation of petroleum product is

Ahexene to hexane
Bcyclohexane to benzene
Chexane to carbon(IV)oxide and water vapour
Dhexane to butane and ethane
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Question 30
jamb 2025

The liquid state of water at room temperature is as a result of

Aelectrovalent bond
Bcovalent bond
Cvan der waals forces
Dhydrogen bond
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Question 31
jamb 2025

The gas that ammoniacal solution of CuCl\(_2\) is used to absorb from producer or water gas is

AH\(_2\)
BCO
CN\(_2\)
DCO\(_2\)
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Question 32
jamb 2025

The stainless steel alloy is used for making

Acutlery
Bpermanent magnets
Crock crushers
Dbridges
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Question 33
jamb 2025

CH\(_3\) - CH\(_2\) - COOCH\(_2\) - CH\(_3\)

From the condensed structure above, the reactants are

Aethanol and ethanoic acid
Bpropanol and propanoic acid
Cpropanol and ethanoic acid
Dpropanoic acid and ethanol
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Question 34
jamb 2025

C\(_2\)H\(_5\)OH   +  CH\(_3\)COOH  ⇌  CH\(_3\)COOC\(_2\)H\(_5\)  +  H\(_2\)O

The reaction above is

Acondensation
Bfermentation
Cesterification
Dhydrolysis
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Question 35
jamb 2025

PCl\(_5\)\((_g\)) → PCl\(_3\)\((_s\))  +  Cl\(_2\)\((_g\))

In the equation above, the reaction will be spontaneous if

AΔH = constant
BΔH = + ve
CΔH = zero
DΔH = - ve
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Question 36
jamb 2025

An example of a salt that can dissolve in water to form a solution with a pH of 7.

Asodium chloride
Bammonium chloride
Cammonium tetraoxosulphate(VI)
Dsodium trioxocarbonate(IV)
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Question 37
jamb 2025

The gas produced at the cathode during electrolysis of brine is

Asteam
Bchlorine
Coxygen
Dhydrogen
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Question 38
jamb 2025

The reaction above is

Aneutralization
Bsubstitution
Cpolymerization
Doxidation
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Question 39
jamb 2025

On heating 12.5g of saturated solution to dryness at 60\(^0\)C, 2g of anhydrous salt was recovered, calculate its solubility in grams per 100g of water.

A16.0
B4.0
C2.0
D20.0
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Question 40
jamb 2025

The process by which iron corrodes is

Arusting
Bburning
Cgalvanizing
Dalloying
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