`H_(2)O_(2)` is a powerful oxidising agent. It is an electron acceptor in acidic as well as in alkaline medium. It can also act as reducing agent towards oxidising agents. In alkaline medium, the reducing nature of `H_(2)O_(2)` is even more effective
In which of the following reactions `H_(2)O_(2)` acts as a reducing agent?

Options

A. `PbO_(2)+H_(2)O_(2) to PbO+H_(2)O+O_(2)`
B. `Na_(2)SO_(3)+H_(2)O_(2) to Na_(2)SO_(4)+H_(2)O`
C. `2KI+H_(2)O_(2) to 2KOH+I_(2)`
D. `KNO_(2)+H_(2)O_(2) to KNO_(3)+H_(2)O`

Explanation

(a) `H_(2)O_(2)` reduces `PbO_(2) "to" PbO`.