A) castor oil
B) oil of vitriol
C) fuming \[{{H}_{2}}S{{O}_{4}}\]
D) none of the above
Correct Answer: C
Solution :
Oleum is obtained by dissolving sulphur trioxide in \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\text{.}\] \[S{{O}_{3}}+{{H}_{2}}S{{O}_{4}}(conc)\to \underset{\text{oleum}}{\mathop{{{H}_{2}}{{S}_{2}}{{O}_{7}}}}\,\] Oleum is also called fuming sulphuric acid because it fumes in moist air due to sulphur trioxide.
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