WAEC Chemistry 2022 Objective — Question 24

Question 24 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.

Which of the following statements about an equilibrium system is correct? Forward and backward reactions occur at the same rate.

A. The concentrations of reactants must equal that of the productsCorrect
B. The concentrations of reactants and products can be changed by adding a catalyst
C. The concentrations of reactants and products are not affected by a change in temperature

Explanation

At equilibrium, the forward and backward reactions occur at the same rate, though the concentrations of reactants and products need not be equal, and temperature changes do shift equilibrium position.

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