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An ideal solution is formed by mixing two volatile liquids \( A \) and \( B . X_{A} \) and \( X_{B} \) are the mole fractions of \( A \) and \( B \) respectively in the solution and \( Y_{A} \) and \( Y_{B} \) are the mole fractions of \( A \) and \( B \) respectively in the vapour phase. A plot of \( \frac{1}{Y_{A}} \) along \( y \)-axis against \( \frac{1}{X_{A}} \) along \( x \)-axis gives a straight line. What is the slope of the straight line ?
(a) \( \frac{P_{B}^{\circ}}{P_{A}^{\circ}} \)
(b) \( \frac{P_{A}^{\circ}}{P_{B}^{\circ}} \)
(c) \( P_{B}^{\circ}-P_{A}^{\circ} \)
(d) \( P_{A}^{\circ}-P_{B}^{\circ} \)
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