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For the reaction H2SO3(aq) + Sn4+(aq) + H2O(l) → Sn2+(aq) + HSO4−(aq) + 3H+(aq), which statement is true?

1. Sn4+ acts as the oxidizing agent since it is oxidized
2. Sn4+ acts as the reducing agent since it is oxidized
3. H2SO3 acts as the reducing agent since it is oxidized
4. H2SO3 acts as the reducing agent since it is reduced

Correct answer: H2SO3 acts as the reducing agent since it is oxidized

Solution

Sn4+ is reduced to Sn2+ (it is the oxidising agent), while sulfur in H2SO3 is oxidised from +4 to +6, so H2SO3 is the reducing agent because it is oxidised (option 2).

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