MCAT General Chemistry Question 242: Answer and Explanation

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Question: 242

4. High valent metals (those with large, positive oxidation states) are often used as strong oxidizing agents. Which of the following compounds would have the most positive reduction potential vs. a standard hydrogen electrode?

A. FeCl₃
B. OsO₄
C. Zn(NO₃)Cl
D. W(CO)₆

Correct Answer: B

Explanation:

B A large, positive reduction potential indicates a strong tendency to be reduced, and hence ability to act as an oxidizing agent. The question states that high-valent metals act as strong oxidizing agents. Examining the oxidation states of the metals in question, we see that Fe = +3, Os = +8, Zn = +2, and W = 0. Therefore, since Os bears the largest positive oxidation state, we know that it is the strongest oxidizing agent.

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