Zinc nitrate, nitrogen dioxide, and water are obtained from the reaction of metallic zinc and nitric acid in an aqueous solution. What is the reducing species?
A) Zn(s)
B) H⁺(aq)
C) HNO₃(aq)
D) Zn²⁺(aq)
E) Zn(NO₃)₂(aq)
IMAT 2024 · Question 40
Q40 - Oxidation and reduction
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The correct answer is A) Zn(s).
Zinc goes from 0 to +2: it loses electrons, so it's oxidised, which makes it the reducing agent. Nitrogen goes from +5 in HNO₃ to +4 in NO₂, so HNO₃ is the oxidising agent.
Zn²⁺ and zinc nitrate are products, so they can't be what does the reducing.
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