In which of the following reactions `H_(2)O_(2)` does not act as a reducing agent ?

Options

A. `I_(2)+H_(2)O_(2)+2OH^(-)to2I^(-)+2H_(2)O+O_(2)`
B. `PbS+4H_(2)O_(2)toPbSO_(4)+4H_(2)O`
C. `2KMnO_(4)+3H_(2)O_(2)to2MnO_(2)+2KOH+2H_(2)O+3O_(2)`
D. `HOCl+H_(2)O_(2)toH_(3)O^(+)+Cl^(-)+O_(2)`

Answer

B

Explanation

(i) In reaction (A), ( C) and (D), `H_(2)O_(2)` is converted into `O_(2)`.

`thereforeH_(2)O_(2)` is reducing agent.
(ii) In reaction (B) `H_(2)O_(2)` is converted to `H_(2)O`.

Here reduction of `H_(2)O_(2)` occurs to `H_(2)OandH_(2)O_(2)` is an oxidising agnet.