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.

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

47 questions
Question 1 of 7 47 total questions
Question 21
jamb 2002

Which of the following equations show that a reaction is in equilibrium?

AΔG < O
BΔG = ΔH – TΔS
CΔG > O
DΔG = O
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Question 22
jamb 2002

What amount of mercury would be liberated if the same quantity of electricity that liberates 0.65g of zinc is applied?

A2.01g
B1.00g
C4.02g
D8.04g
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Question 23
jamb 2002

In the reaction E+F ↔ G+H, the backward reaction is favoured if the concentration of

AF is increased
BE is increased
CE is reduced
DG is reduced
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Question 24
jamb 2002

The chromatography separation of ink is based on the ability of the components to

AReact with solvent
BReact with each other
CDissolve in each other in the column
DMove at different speeds in the column
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Question 25
jamb 2002

A little quantity of trichloromethane (b.pt 60\(^0\)C) was added to a large quantity of ethanol (b.pt 78\(^0\)C). The most probable boiling point of the resultant mixture is from

A69 oC - 70 oC
B70 oC – 74 oC
C82 oC – 84 oC
D60 oC – 78 oC
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Question 26
jamb 2002

The formula CH\(_2\)O for ethanoic acid is regarded as its

AMolecular formula
BGeneral formula
CEmpirical formula
DStructural formula
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Question 27
jamb 2002
A compound contains 31.91% potassium, 28.93% chlorine and the rest oxygen. What is the chemical formula of the compound?
[K = 39, Cl = 35.5, O = 16]
AKClO4
BKClO
CKClO2
DKClO3
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