The vapour pressure of pure liquids $A$ and $B$ are $450 \ mm$ and $700 \ mm$ of $Hg$ at $350 \ K$ respectively. If the total vapour pressure of the mixture is $600 \ mm$ of $Hg$,the composition of the mixture in the solution is
- A$\chi_{A}=0.4, \chi_{B}=0.6$
- B$\chi_{A}=0.6, \chi_{B}=0.4$
- C$\chi_{A}=0.3, \chi_{B}=0.7$
- D$\chi_{A}=0.7, \chi_{B}=0.3$
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