WAEC Chemistry 2019 Objective — Question 31

Question 31 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

If a catalyst is added to a system at equilibrium and the temperature and pressure remain constant, there would be no effect on the

A. activation energy of the reaction
B. rate of the forward reaction
C. rate of the reverse reaction
D. heat of reactionCorrect

Explanation

A catalyst speeds up both the forward and reverse reactions equally (by lowering activation energy) and does not alter the position of equilibrium or the heat of reaction.

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