Which of the following changes represents reduction?

MnO₄^-1(aq) → MnO₂(s)

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I^-1(aq) → I₂ (s)

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Fe²⁺ (aq) → Fe³⁺(aq)

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Br^-(aq) → BrO₃^-(aq)

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Solution

The correct option is A
MnO₄^-1(aq) → MnO₂(s)

Since oxidation number of Mn changes from +7 to +4. So, it is reduction.

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