MCAT General Chemistry Question 83: Answer and Explanation
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Question: 83
8. If the reaction FeI (aq) + I2 (g) → FeI3 (aq) were exothermic, what effect would decreasing the temperature have on the equilibrium?
- A. The forward reaction rate and the reverse reaction rate both increase.
- B. The forward reaction rate decreases while the reverse reaction rate increases.
- C. The forward reaction rate increases while the reverse reaction rate decreases.
- D. The forward reaction rate and the reverse reaction rate both decrease.
Correct Answer: C
Explanation:
An exothermic reaction produces heat. Decreasing the temperature favors product formation, resulting in an increase in the forward reaction rate with a concomitant decrease in the reverse reaction rate.