Rates of Chemical Reaction - Jamb Chemistry Past Questions and Answers

Question 21:

• JAMB 1984

Which of the curves shown in the figure given represents the relationships between the volume(V) and pressure(P) of an ideal gas at constant temperature

A. 1
B. 2
C. 3
D. 4
E. 1 and 3

Question 22:

• JAMB 1985

Solid sodium hydroxide on exposure to air absorbs a gas and ultimately gives another alkaline substance with the molecular formula?

A. NaOH.H₂O
B. NaOH.N₂
C. Na₂CO₃O
D. NaHCO₃
E. NaNO₃O

Question 23:

• JAMB 1987

The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO_2(g) + O_2(g) ↔ 2SO_3(g), ∆H = -196 kJ. What factor would influence increased production of SO_3(g)?

A. Addition of a suitable catalyst
B. Increase in the temperature of the reaction
C. Decrease in the temperature of the reaction
D. Decrease in the concentration of SO_2(g)

Question 24:

• JAMB 1987

If d represents the density of a gas and K is a constant, the rate of gaseous diffusion r is related to d by the equation?

A. R = k/√d
B. R = kd
C. R =k/d
D. R = k √d

Question 25:

• JAMB 1988

Which of the following will produce the greatest increase in the rate of the chemical reaction represented by the equation Na₂S₂O_3(aq) + 2HCl_(aq) → 2NaCI_(aq) + H₂O_(I) + SO_2(g) + S_(g)?

A. A decrease in temperature and an increase in the concentration of the reactants
B. An increase in the temperature and a decrease in the cocentration of the reactants
C. An increase in temperature and an increase in the concentration of the reactants
D. A decrease in the temperature and a decrease in the concentration of the reactants