In the reaction 2Fe³⁺ + Sn²⁺ → 2Fe²⁺ + Sn⁴⁺, which species is the reducing agent?
Correct answer C. Sn²⁺
Explanation
Sn²⁺ loses two electrons and is oxidised to Sn⁴⁺. By losing electrons it reduces Fe³⁺ to Fe²⁺, so Sn²⁺ is the reducing agent.
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