Rates of Chemical Reaction - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1978

Consider the following exothermic reaction
2SO_2(g) + O_2(g) ↔ 2SO_3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then

A. The reaction rate increases
B. Concentration of SO₃ decreases
C. Concentration of SO₃ increases
D. SO₂ gas becomes unreactive
E. O₃ gas becomes unreactive

Question 7:

• JAMB 1979

Consider the following exothermic reaction 2SO₂(g) + O₂(g) = 2SO₃ (g) . If the temperature of the reaction is reduced from 800_oC to 500_oC, and no other change takes place, then

A. The reaction rate increases
B. Concentration of SO₃ decreases
C. Concentration of SO₃ increases
D. SO₂ gas becomes unreactive
E. O₂ gas becomes unreactive

Question 8:

• JAMB 1980

Which of the following reactions is correct as as written?

A. FeCl₂ + 3NH₄OH → Fe(OH)₃ + 3NH₄Cl
B. Pb₂O₃ + 4HCl → PbCl₂ + 2H₂O
C. PbNO₃ + H₂S → PbS + 2HNO₃
D. NaOH + H₂SO₄ → NaHSO₄ +H₂O
E. 2NH₄NO₃ → N₂ + 2H₂O

Question 9:

• JAMB 1980

When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?

A. Substitution
B. Addition
C. Polymerization
D. Hydrolysis
E. Reduction

Question 10:

• JAMB 1980

The following graph demonstrates the rate of reaction between calcium carbonate (marble)and dilute hydrochloric acid. The graph shows that the rate of reaction is initially greatest when

A. The initial slope of the curve is steepest and this occur when small pieces of marble are used and is due to a small surface area of reactant
B. The occur when large pieces of marble are used and is due to a small surface area of reactant
C. The initial slope of the curve is steepest and this occurs when small pieces of marble are used and is due to a large surface area of reactant
D. The initial slope of the curve is steepest and this occur when large surface area of reactant
E. The initial slope of the curve is least steep and this occur when small pieces of marble are used and is due to the increased surface area of the reactant