In which of the following reactions H2O2 acts as a reducing agent? (a) H2O2 + 2H+ + 2e− → 2H2O (b) H2O2 − 2e− → O2 + 2H+ (c) H2O2 + 2e− → 2OH− (d) H2O2 + 2OH− − 2e− → O2 + 2H2O

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(b), (d). In reactions (b) and (d), H2O2 is oxidized to O2, which means it loses electrons and acts as a reducing agent by donating electrons to another species. This is characteristic of a reducing agent, as it facilitates the reduction of another substance while being oxidized itself.

In which of the following reactions H2O2 acts as a reducing agent? (a) H2O2 + 2H+ + 2e− → 2H2O (b) H2O2 − 2e− → O2 + 2H+ (c) H2O2 + 2e− → 2OH− (d) H2O2 + 2OH− − 2e− → O2 + 2H2O

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