MCAT General Chemistry Question 161: Answer and Explanation

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Question: 161

11. If a certain metal has multiple oxidation states, its acidity as an oxide generally increases as the oxidation state increases. Therefore, which of the following tungsten compounds is likely to be the strongest acid?

A. WO₂
B. WO₃
C. W₂O₃
D. W₂O₅

Correct Answer: B

Explanation:

Recall that oxygen has an oxidation state of -2. Therefore, in tungsten(IV) oxide, choice (A), tungsten has an oxidation state of +4. In tungsten(VI) oxide, choice (B), it has an oxidation state of +6. In tungsten(III) oxide, choice (C), it is +3. In tungsten pentoxide, choice (D), it is +5.

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