At $300 \ K$,the vapour pressures of $A$ and $B$ liquids are $500 \ mm \ Hg$ and $400 \ mm \ Hg$ respectively. Equal moles of $A$ and $B$ are mixed to form an ideal solution. The mole fraction of $A$ and $B$ in the vapor state is respectively:

  • A
    $0.5, 0.5$
  • B
    $0.666, 0.333$
  • C
    $0.444, 0.555$
  • D
    $0.555, 0.444$

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Assuming ideal behaviour,the enthalpy and volume of mixing of two liquids respectively,are

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