$[1991]$
(a) Castor Oil
(b) Oil of vitriol
(c) Fuming $\mathrm{H}_2 \mathrm{SO}_4$
(d) None of them
Correct Answer: 53.(c)
Solution: (c) Oleum is $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_7\left(\mathrm{H}_2 \mathrm{SO}_4+\mathrm{SO}_3\right)$ which is obtained by dissolving $\mathrm{SO}_3$ in $\mathrm{H}_2 \mathrm{SO}_4$ and is called fuming sulphuric acid.
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