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Which of the following statements are correct?
(i) \( \mathrm{S}-\mathrm{S} \) bond is present in \( \mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6} \).
\( \mathrm{P} \)
(ii) In peroxosulphuric acid \( \left(\mathrm{H}_{2} \mathrm{SO}_{5}\right) \) sulphur is in \( +6 \) oxidation state.
(iii) Iron powder along with \( \mathrm{Al}_{2} \mathrm{O}_{3} \) and \( \mathrm{K}_{2} \mathrm{O} \) is used as a catalyst in the
W preparation of \( \mathrm{NH}_{3} \) by Haber's process.
(iv) Change in enthalpy is positive for the preparation of \( \mathrm{SO}_{3} \) by catalytic oxidation of \( \mathrm{SO}_{2} \).
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