In which of the following reactions, `H_(2)O_(2)` is acting as a reducing agent

Options

A. `H_(2)O_(2)+SO_(2) to H_(2)SO_(4)`
B. `2KI+H_(2)O_(2) to 2KOH+I_(2)`
C. `PbS+4H_(2)O_(2) to PbSO_(4)+4H_(2)O`
D. `Ag_(2)O+H_(2)O_(2) to 2Ag+H_(2)O+O_(2)`

Answer

D

Explanation

`SO_(2)` changes to `H_(2)SO_(4)` (O.N. changes from +4 to +6 oxidation)
`2KI to I_(2)` (O.S. changes from -1 to 0 oxidation) ,brgt `PbS to PbSO_(4) ` (O.S. changes from -2 to +6 oxidation)
`Ag_(2)O to 2Ag` (O.S. changes from +1 to 0 reduction).