Two liquids \( A \) and \( B \) have \( P_{A}^{\circ} \) and \( P_{B}^{\circ} \) in the ratio of...

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Two liquids \( A \) and \( B \) have \( P_{A}^{\circ} \) and \( P_{B}^{\circ} \) in the ratio of \( 1: 3 \) and the ratio of number of moles of \( A \) and \( B \) in liquid phase are \( 1: 3 \). Then mole fraction of ' \( A \) ' in vapour phase in equilibrium with the solution is equal to:
(a) \( 0.1 \)
(b) \( 0.2 \)
(c) \( 0.5 \)
(d) \( 1.0 \)
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