Which of the following statements about the following reaction is`//`are not correct?
`Cr_(2)O_(7)^(2-)+3H_(2)O_(2)+8H^(o+)to2Cr^(3+)+7H_(2)O+3O_(2)`

Options

A. `H_(2)O_(2)` is oxidised to `O_(2)`
B. `H_(2)O_(2)` is reduced to `H_(2)O`
C. The oxidation number of chromium atom changes by `3`.
D. Hydrogen ions are oxidised to `H_(2)O`

Answer

B, D

Explanation

Since `Cr_(2)O_(7)^(2-)` is reduced to `Cr^(3+)`, so `H_(2)O_(2)` must be oxidised to `O_(2)`
Oxidation number of `Cr` in `Cr_(2)O_(7)^(2-)` is `+6` and `+3` in `Cr^(3+)` . So change in oxidation state `=+3`.
Hence, statements (b) and (d) are wrong.