1.

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

Answer»

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

SOLUTION :In the reaction,

OXIDATION number of oxygen increases from `-1` to 0. Hence, `H_(2)O_(2)` acts are reducing agent.
Decreases in `ON^(-)` (reduction)


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