WAEC Chemistry 2011 Objective — Question 34

Question 34 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Which of the following conditions would lead to an increase in the rate of a reaction?

A. A. Increase in temperature and decrease in the surface area of reactants
B. B. Increase in temperature and concentration of reactantsCorrect
C. C. Decrease in temperature and increase in concentration of reactants
D. D. Decrease in temperature and increase in the surface area of reactants

Explanation

As temperature and concentration both increase, the rate of a reaction increases; both factors provide more energetic, more frequent collisions between reacting particles.

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