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At $350 \mathrm{~K}$, the vapour pressure of pure liquids $A$ and $B$ are $450 \mathrm{~mm}$ and $700 \mathrm{~mm}$ respectively. If the total vapour pressure of liquid mixture is $600 \mathrm{~mm}$ of $\mathrm{Hg}$, the mole fractions of $\mathrm{A}$ and $B$ in vapour phase respectively are :
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The correct answer is:
$0.3,0.7$
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