$Oleum$ (also known as $Sulphan$) is

  • A
    a mixture of $SO_{3}$ and $H_{2}SO_{3}$
  • B
    $100\%$ conc. $H_{2}SO_{4}$
  • C
    a 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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