Which of the following statements is not correct ?

Options

A. The oxidation number of `S` in `(NH_(4))_(2)S_(2)O_(8)` is `+6`.
B. The oxidation number of `O` s in `OsO_(4)` is `+8`.
C. The oxidation number of `S` in `H_(2)SO_(5)` is `+8`.
D. The oxidation number of `O` in `KO_(2)` is` -1//2`.

Answer

C

Explanation

a. `(overset(+1)(NH_(4)))_(2)S_(2)O_(8)^(2-)`
`:.` Oxidation state of `S= +6`
(Since `S_(2)O_(8)^(2-)` has one peroxide bond)
b. Oxidation state of `Os= +8`
c. Oxidation state of `S` in `H_(2)SO_(5)= +6`
(Since it has one peroxide bond)
d. `K^(1+)O_(2)^(1-)`, oxidation state of `O = -1//2`