$Oleum$ (also known as $Sulphan$) is
- Aa mixture of $SO_{3}$ and $H_{2}SO_{3}$
- B$100\%$ conc. $H_{2}SO_{4}$
- Ca mixture of gypsum and conc. $H_{2}SO_{4}$
- D$100\%$ oleum (a mixture of $SO_{3}$ in $H_{2}SO_{4}$)
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