MCAT General Chemistry Question 151: Answer and Explanation

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Question: 151

1. Consider the following equation:

6 Na (s) + 2 NH₃ (aq) → 2 Na₃N (s) + 3 H₂ (g)

Which species acts as an oxidizing agent?

A. Na
B. N in NH₃
C. H in NH₃
D. H₂

Correct Answer: C

Explanation:

The oxidizing agent is the species that is reduced in any given equation. In this problem, six hydrogen atoms with +1 oxidation states in NH₃ are reduced to three neutral H₂ molecules.

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