A) \[{{H}_{2}}S{{O}_{4}}+S{{O}_{3}}\]
B) \[{{H}_{2}}S{{O}_{4}}+S{{O}_{2}}\]
C) \[{{H}_{2}}S{{O}_{4}}\]
D) \[{{H}_{2}}S{{O}_{4}}+S{{O}_{4}}\]
Correct Answer: A
Solution :
Fuming sulphuric acid is oleum\[({{H}_{2}}{{S}_{2}}{{O}_{7}})\]i.e.\[{{H}_{2}}S{{O}_{4}}+S{{O}_{3}}\xrightarrow{{}}\underset{Pyrosulphuric\,\,acid}{\mathop{{{H}_{2}}{{S}_{2}}{{O}_{7}}}}\,\] \[S{{O}_{3}}\]is absorbed in concentrated\[{{H}_{2}}S{{O}_{4}}\] to give oleum.
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