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Chemistry Past Questions and Answers

Jamb Chemistry Questions

Question 21:

A metal M displaces zinc from zinc chloride solution. This shows that

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A M is more electronegative than zinc
B Zinc is above hydrogen in the series
C M is more electropositive than zinc
D Electrons flow from zinc to M

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Question 22:

Which of the following best explains the increase in the rate of a chemical reaction as the temperature rises?

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A The bonds in the reacting molecules are more readily broken
B The molecular collisions become more violent
C A lower proportion of the molecules has the necessary minimum energy to react
D The collision frequency of the molecules increase

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Question 23:

What current in amperes will deposit 2.7g of aluminium in 2 hours?
[Al = 27, F = 96 500 C mol^-1]

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A 32
B 8
C 4
D 16

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Question 24:

Ethanoic acid is

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A Tribasic
B Unionizeable
C Monobasic
D Dibasic

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Question 25:

C_(s) + 2S_(g) â†’ CS_2(g)
Î”H = +89 kJ mol^-1
The chemical equation above implies that

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A Each of carbon and sulphur has 89 kJ of energy
B Both carbon and sulphur contribute 89 kJ of energy
C 89 kJ of energy is released
D 89 kJ of energy is absorbed

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