Q29 / 200 · WBJEE 2013 · Chemistry
Sulphan' is
- Aa mixture of $\mathrm{SO}_{3}$ and $\mathrm{H}_{2} \mathrm{SO}_{3}$
- B$100 \%$ conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$
- Ca mixture of gypsum and conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$
- Correct answerD$100 \%$ oleum (a mixture of $100 \% \mathrm{SO}_{3}$ in $100 \%$ $\left.\mathrm{H}_{2} \mathrm{SO}_{4}\right)$
Solution
$\mathrm{H}_{2} \mathrm{SO}_{4}$ saturated with $\mathrm{SO}_{3}$ is called oleum of sulphan.
$$
\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{SO}_{3} \longrightarrow \mathrm{H}_{2} \mathrm{S}_{2} \mathrm{O}_{7}
$$
Hence, the correct answer is option: 'D'.