MCAT General Chemistry Question 246: Answer and Explanation

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Question: 246

8. An electrochemical cell is constructed using two inert electrodes in one chamber with an inert electrolyte. The binary compound ICl is dissolved in the electrolyte, current is applied, and I₂ and Cl₂ are produced. Which of the following statements is true?

A. Cl₂ was produced by reduction at the cathode.
B. I₂ was produced by oxidation at the cathode.
C. Cl₂ was produced by oxidation at the cathode.
D. I₂ was produced by reduction at the cathode.

Correct Answer: D

Explanation:

D In the compound ICl, I has an +1 oxidation state, and Cl has a –1 oxidation state owing to the greater electronegativity of Cl. Therefore, production of Cl₂ must be an oxidation, and production of I₂ must be a reduction eliminating choices A and B. Moreover, reduction always takes place at the cathode, eliminating choice C.

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