Which of the following statements is not correct?

Options

A. The oxidation number of S in `(NH_4)_2S_2O_8` is + 6.
B. The oxidation number of Os in `OsO_4` is +8.
C. The oxidation number of S in `H_2SO_5` is +8 . .
D. The oxidation number of O in `KO_2` is -1/2

Answer

C

Explanation

(c) (a) `overset(+1)(NH_4)_2S_2O_(8)^(2-)`
`therefore` Oxidation state of S =+6 (Since `S_2O_(8)^(2-)` has one peroxide bond)
Oxidation state of Os= +8
(c) Oxidation state of S in `H_2SO_5 = +6` (Since it has one peroxide bond) (d) `K^(1+)O_2^(1-)`, oxidation state of O =-1/2