MCAT General Chemistry Question 87: Answer and Explanation

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Question: 87

12. Which of the following is true of equilibrium reactions?

I. An increase in k1 results in a decrease in k–1.

II. As the concentration of products increases, the concentrations of reactants decreases.

III. The equilibrium constant is altered by changes in temperature.

  • A. I only
  • B. II and III only
  • C. I and III only
  • D. I, II, and III

Correct Answer: B

Explanation:

Statement I is false because the addition of a catalyst could increase the rate constants of both the forward and reverse reactions. Statement II is true because—for products to come into existence—reactants must be used up. Statement III is also true: all K values are temperature-dependent.

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