Question

Which of the following oxyacid of sulphur contain S-O-S linkage?

Options

• H₂S₂O₂

• H₂S₂O₅

• H₂S₂O₃

• H₂S₂O₇

Answer 1

H₂S₂O₇

Explanation:

1. H₂S₂O₂ - Throsulphurous acid

\[\begin{array}{cc}
\ce{S}\\
||\\
\ce{HO - S - OH}
\end{array}\]

2. H₂S₂O₅ - Disulphurous acid

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

3. H₂S₂O₃ - Thiosulphuric acid

\[\begin{array}{cc}
\ce{S}\\
||\\
\ce{HO - S - OH}\\
||\\
\ce{O}
\end{array}\]

4. H₂S₂O₇ - Pyrosulphuric acid

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