Question

Which of the following statements are correct?

(i) S – S bond is present in \[\ce{H2S2O6}\].

(ii) In peroxosulphuric acid \[\ce{(H2SO5)}\] sulphur is in +6 oxidation state.

(iii) Iron powder along with \[\ce{Al2O3}\] and \[\ce{K2O}\] is used as a catalyst in the preparation of \[\ce{NH3}\] by Haber’s process.

(iv) Change in enthalpy is positive for the preparation of \[\ce{SO3}\] by catalytic oxidation of \[\ce{SO2}\].

Answer 1

(i) S – S bond is present in \[\ce{H2S2O6}\].

(ii) In peroxosulphuric acid \[\ce{(H2SO5)}\] sulphur is in +6 oxidation state.

Explanation:

\[\begin{array}{cc}
\ce{O}\phantom{...}\ce{O}\\
||\phantom{...}||\\
\underset{//\phantom{...}|\phantom{........}|\phantom{...}\backslash\backslash}{\ce{S}-\ce{S}}\\
\ce{O}\phantom{..}\ce{OH}\phantom{.}\ce{OH}\phantom{.}\ce{O}
\end{array}\]

In \[\ce{H2SO5}\], there is a peroxo-linkage.

(O in peroxide linkage has oxidation state – 1)