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Which of the following statements are correct?

(i) S–S bond is present in $H_{2}S_{2}O_{6}$

(ii) In peroxosulphuric acid $\left ( H_{2}SO_{5} \right )$ sulphur is in +6 oxidation state.

(iii) 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.

(iv) Change in enthalpy is positive for the preparation of $SO_{3}$ by catalytic oxidation of $SO_{2}$

Answers (1)

The answer is the option (i, ii)

In $H_{2}SO_{5}$ , there is a peroxo-linkage.

$O$ in peroxide linkage has oxidation state - 1

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