Identify the $FALSE$ statement about ideal solutions from the following.

  • A
    Ideal solutions obey Raoult's law over the entire range of concentration.
  • B
    No heat is evolved or absorbed when two components forming an ideal solution are mixed.
  • C
    The volume of an ideal solution is the same as the sum of the volumes of the two components taken for mixing.
  • D
    The vapour pressure of an ideal solution is either higher or lower than the vapour pressure of the pure components.

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Two liquids $A$ and $B$ have vapour pressure in the ratio $P_A^o : P_B^o = 1 : 3$ at a certain temperature. Assume $A$ and $B$ form an ideal solution and the ratio of mole fractions of $A$ to $B$ in the vapour phase is $4 : 3$. Then the mole fraction of $B$ in the solution at the same temperature is

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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:

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