Rates of Chemical Reaction - Jamb Chemistry Past Questions and Answers

Question 46:

• JAMB 2001

25cm³ of a gas X contains Z molecules at 15^oC and 75 mmHg. How many molecules will 25 cm³ of another gas Y contain at the same temperature and pressure?

A. 2 Y
B. 2 Z
C. Z
D. Y

Question 47:

• 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 48:

• JAMB 2002

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

A. F is increased
B. E is increased
C. E is reduced
D. G is reduced

Question 49:

• JAMB 2002

PCl_5(g) ↔ PCl_3(g) + Cl_2(g)
In the reaction above, a decrease in pressure will

A. Decelerate the reaction
B. Increase the yield of PCl₃
C. Increase the yield of PCl₅
D. Accelerate the reaction

Question 50:

• JAMB 2002

The Arrhenius equation expresses the relationship between the speed of a reaction and its

A. Molecular collision
B. Heat of reaction
C. Catalyst
D. Activation energy