Rates of Chemical Reaction - Jamb Chemistry Past Questions and Answers

Question 51:

• JAMB 2003

Which of the following will change when a catalyst is added to a chemical reaction?

A. The activation energy
B. The potential energy of the reactants
C. The heat of the reaction
D. The potential energy of the product

Question 52:

• JAMB 2004

Which of the following shows little or no net reaction when the volume of the system is decreased?

A. H_2(g) + I_2(g) ↔ 2HI_(g)
B. 2NO_2(g) ↔ N₂O_4(g)
C. PCl_5(g) ↔ PCl_3(g) + Cl_2(g)
D. 2O_3(g) ↔ 3O_2(g)

Question 53:

• JAMB 2005

Phenolphthalein in acidic solution is

A. Red
B. Orange
C. Colourless
D. Yellow

Question 54:

• JAMB 2005

N_2(g) + 3H_2(g) ↔ 2NH_3(g) ΔH = -90 kJ
In the equation above, the yield of ammonia can be decreased by

A. Increasing the pressure
B. Removing the ammonia as it is formed
C. Increase the temperature
D. Adding a catalyst

Question 55:

• JAMB 2006

The efficiency of a solid catalyst to increase reaction rates depends on its

A. Surface area
B. Solubility
C. Concentration
D. Quantity