Which of the following is incorrect?

Options

A. `H_(2)O_(2)` is a weak acid
B. `H_(2)O_(2)` is a weak alkali
C. `H_(2)O_(2)` acts as an oxidising agent
D. `H_(2)O_(2)` is a reducing agent

Answer

A

Explanation

`H_(2)O_(2)` is slightly stronger acid than water, it forms two series of salt,
`H_(2)O_(2)hArrH^(+)+HO_(2)^(-)`
(hydroperoxide ion)
`H_(2)O_(2)hArr2H^(+)+O_(2)^(2-)` (peroxide ion)
`H_(2)O_(2)k` behaves as oxidising as well as reducing agent in acidic and alkaline medium.
As oxidising agent,
in acidic medium
`H_(2)O_(2)+2H^(+)+2e^(-)to2H_(2)O`
in alkaline medium.
`H_(2)O_(2)+OH^(-)+2e^(-)to3OH^(-)`
As reducing agent,
in acidic medium,
`H_(2)O_(2)to2H_(+)+O_(2)+2e^(-)`
in alkaline medium,
`H_(2)O_(2)+2OH^(-)to2H_(2)O+O_(2)+2e^(-)`