Hydrogen peroxide is a powerful oxidising agent.
It is an electron acceptor in acidic and alkaline mediums .
`H_(2)O_(2) + 2H^(+) + 2e^(-) rarr H_(2)O` (in acidic medium )
`H_(2)O_(2) + 2e^(-) rarr 2OH^(-)` (in alkaline medium)
It can also act as reducing agent towards powerful oxidising agents . `H_(2)O_(2) rarr 2H^(+) + O_(2) + 2e`
In alkaline medium , however , its reducing nature is more effective . `H_(2)O_(2) + 2OH^(-) rarr 2H_(2)O + O_(2) + 2e^(-)`
In which of the following reactions , `H_(2)O_(2)` acts as an oxidising agent ?

Options

A. `IO_(4)^(-) + H_(2)O_(2) rarr IO_(3)^(-) + H_(2)O + O_(2)`
B. `2I^(-) + H_(2)O_(2) + 2H^(+) rarr I_(2) + 2H_(2)O`
C. `Ag_(2)O + H_(2)O_(2) rarr 2Ag + H_(2)O + O_(2)`
D. `2MnO_(4)^(-) + 6H^(+) + 5H_(2)O_(2) rarr 2Mn^(2+) + 8H_(2)O + 5O_(2)`

Answer

B