Waec Chemistry 2005 Past Questions and Answers

Question 11:

• WAEC 2005

In which of the following reactions is the position of equilibrium not affected by an increase in pressure?

A. 3Fe_(s) + 4H₂O_(g) ⇌ Fe₃O_4(s) + 4H_2(g)
B. 2NO_2(g) ⇌ N₂O _4(g)
C. 3H_2(g) + N_2(g) ⇌ 2NH_3(g)
D. 2SO_2(g) + O_2(g) ⇌ 2SO_3(g)

Question 12:

• WAEC 2005

The activation energy of a reaction can be altered by

A. Adding a reducing agent
B. Applying a high pressure
C. Using a catalyst
D. Changing the temperature

Question 13:

• WAEC 2005

Which of the following factors does not affect the rate of reaction of CaCO₃ with HCI?

A. Temperature of the reaction
B. Solubility of the CaCO₃
C. Concentration of the HCI
D. Surface area of the CaCO₃

Question 14:

• WAEC 2005

When X is heated with manganese (IV) oxide, oxygen is produced X is

A. KCI
B. KCIO₃
C. CaCO₃
D. ZnCO₃

Question 15:

• WAEC 2005

Which of the following statements is not a postulate of the kinetic theory of gases?

A. Molecules move with the same speed
B. Intermolecular forces are negligible
C. Molecules are in a state of constant random motion
D. Collision between molecules is elastic