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STD 12 - p -Block elements - ll — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 12 - p -Block elements - ll4 Marks
MCQ
Which of the following statement is correct for oleum ?
  • ✓
    It is prepared by adsorption of $SO _{3}$ in conc. $H _{2} SO _{4}$
  • B
    It contains $O-O$ groups
  • C
    I has six $OH $ groups
  • D
    None 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:

$H _{2} SO _{4}(l)+ SO _{3}( g ) \rightarrow H _{2} S _{2} O _{7}($ 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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