MCQ
Which of the following statement is correct for oleum ?
- ✓It is prepared by adsorption of $SO _{3}$ in conc. $H _{2} SO _{4}$
- BIt contains $O-O$ groups
- CI has six $OH $ groups
- DNone of these
✓
Answer
Correct option: A.
It is prepared by adsorption of $SO _{3}$ in conc. $H _{2} SO _{4}$
a
Oleum is manufactured by adsorption of sulphur trioxide in concentrated sulphuric acid. The reaction is as follows:
Oleum is manufactured by adsorption of sulphur trioxide in concentrated sulphuric acid. The reaction is as follows:
$H _{2} SO _{4}(l)+ SO _{3}( g ) \rightarrow H _{2} S _{2} O _{7}($ oleum $)$
The structure of oleum is shown below :
$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||}
\end{array}} \\
{H - O - S - O - S - O - H} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O}
\end{array}$
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