Which of the following statements are correct ?

Options

A. S-S bond is present in `H_(2)S_(2)O_(6)`.
B. In peroxosulphuric acid `(H_(2)SO_(5))` sulphur is in +6 oxidations state.
C. Iron powder along with `Al_(2)O_(3)` and `K_(2)O` is used as a catalyst in the preparation of `NH_(3)` by Haber's process.
D. Change in enthalpy is positive for the preparation of `SO_(3)` by catalytic oxidation of `SO_(2)`.

Answer

B

Explanation

In `H_2SO_5`, there is a peroxo-linkage :

(O in peroxide linage has oxidation state - 1)