Rates of Chemical Reaction - Jamb Chemistry Past Questions and Answers

Question 11:

• JAMB 1982

In the chemical reaction A + B \(\to\) C + D, more of D is formed?

A. If the concentrated of A is reduced
B. If the concentrated of B is reduced
C. If the concentrated of C is reduced
D. If the concentration of C is increased
E. If D is continuously removed from the reaction mixture

Question 12:

• JAMB 1982

The production of ammonia by the haber process may be represented by the equilibrium equation N₂(g) + 3H₂(g) ↔ 2NH₃ ∆H = -22KJ. Therefore the production of ammonia will be favoured by?

A. Only high pressure
B. Only high temperature
C. A combination of high temperature and low pressure
D. A combination of low temperature and high pressure
E. Low pressure

Question 13:

• JAMB 1982

If the rate of diffusion of oxygen gas is taken as 1, what will be rated of diffusion of methane whose relative molar mass is 16?

A. 2.0
B. 1.8
C. 1.4
D. 1.0
E. 0.5

Question 14:

• JAMB 1982

9.8g of solid potassium chlorate (KCIO₃) were added to 40 cm³ of water and heated to dissolve all the solid. As he solution cooled, crystals of potassium chlorate started forming at 60°C. The solubility of potassium chlorate at 66°C is therefore?

A. 24.5 mole per dm³
B. 0.2 mole per dm³
C. 10.0 mole per dm³
D. 20.0 mole per dm³
E. 2.0 mole per dm³

Question 15:

• JAMB 1982

Which of the following combinations of conditions may increase the rate of a chemical reaction?

A. Decrease in temperature, increase in concentration of the reactants
B. Increase in temperature, addition of a catalyst, decrease in the surface area of the reactants
C. Increase in temperature, increase in concentration, addition of a catalyst and increase in the surface area of the reactants
D. Decrease in temperature concentration and surface area of the reactants
E. Additionof a catalyst and in the absence of light