MCAT General Chemistry Question 178: Answer and Explanation

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Question: 178

13. An electrolytic cell necessarily has:

A. ΔS° > 0
B. ΔG° < 0
C. K_eq < 1
D. E^°_cell > 0

Correct Answer: C

Explanation:

An electrolytic cell is nonspontaneous. Therefore, the ΔG° must be positive and E^°_cell must be negative, eliminating choices (B) and (D). The change in entropy may be positive or negative, depending on the species involved, eliminating choice (A). According to the equation ΔG° = -RT ln K_eq, K_eq < 1 would result in ln K_eq < 0, which means ΔG° > 0.

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