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In which of the following reactions H 2 O 2 acts as a reducing agent ? (a) H 2 O 2 + 2H + + 2e – → 2H 2 O (b) H 2 O 2 – 2e – → O 2 + 2H + (c) H 2 O 2 + 2e – → 2OH – (d) H 2 O 2 + 2OH – – 2e – → O 2 + 2H 2 O

1. (c), (d)
2. (a), (c)
3. (b), (d)
4. (a), (b)

Correct answer: (b), (d)

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