1.

Which of the following is incorrect

Answer»

`H_(2)O_(2)` is a weak acid
`H_(2)O_(2)` is a weak alkali
`H_(2)O_(2)` acts as on oxidising agent
`H_(2)O_(2)` is a reducing agent

Solution :`H_(2)O_(2)` is slightly stronger acid than water, it forms two series of salt,
`H_(2)O_(2) IFF H^(+)+HO_(2)^(-)` (hydroperoxide ion)
`H_(2)O_(2) iff 2H^(+)+O_(2)^(2-)` (Peroxideion)
`H_(2)O_(2)` behaves as oxidising as well as reducing agent in ACIDIC and BASIC medium.
In acidic medime,
`H_(2)O_(2)+2H^(+)2e^(-) RARR 2H_(2)O`
in basic medime,
`H_(2)O_(2)+OH^(-1)+2e rarr 3OH^(-)`
As reducing agent, in acidic medium,
`H_(2)O_(2) rarr 2H^(+)+O_(2)+2e^(-)`
In alkaline medium,
`H_(2)O_(2)+2OH^(-) rarr 2H_(2)O+O_(2)+2e^(-)`


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