MCAT General Chemistry Question 172: Answer and Explanation

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Question: 172

7. If the surface area of electrode material in an electrochemical cell is tripled, what else is necessarily tripled?

I. E°_cell

II. Current

III. K_eq

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

Correct Answer: B

Explanation:

Potential, as measured by E^°_cell, is dependent only on the identity of the electrodes and not the amount present. Similarly, the equilibrium constant depends only on the identity of the electrolyte solutions and the temperature. However, as the electrode material is increased, the surface area participating in oxidation-reduction reactions is increased and more electrons are released, making statement II correct.

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