Jamb Chemistry 2001 Past Questions and Answers

Question 21:

• JAMB 2001

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

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

Question 22:

• JAMB 2001

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

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

Question 23:

• JAMB 2001

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

A. 32
B. 8
C. 4
D. 16

Question 24:

• JAMB 2001

Ethanoic acid is

A. Tribasic
B. Unionizeable
C. Monobasic
D. Dibasic

Question 25:

• JAMB 2001

C_(s) + 2S_(g) → CS_2(g)
ΔH = +89 kJ mol^-1
The chemical equation above implies that

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