In which of the following reactions `H_(2)O_(2)` acts as a reducing agent ?

Options

A. `HOCl + H_(2)O_(2) overset(H^(+)) to H_(3)O^(+) + Cl^(-) + O_(2)`
B. `Mn^(2+) + H_(2)O_(2) overset(OH^(+)) to Mn^(4+) + 2OH^(-)`
C. `2Fe^(2+) + H_(2)O_(2) overset(OH^(-)) to 2Fe^(3+) + 2OH^(-)`
D. `PbS(s) + 4H_(2)O(aq) overset(H^(-)) to PbSO_(4)(s) + 4H_(2)O(l)`

Answer

A

Explanation

In the reactions

Oxidation number of oxygen increases from `-1` to 0. Hence, `H_(2)O_(2)` acts as reducing agent.