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Which of the following behaviours is not true for an ideal binary liquid solution?

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Plot of $p_{A}$ versus $x_{A}$ (mole fraction of A in liquid phase) is linear

Plot of $p_{total}$ versus $x_{A}$ (or $x_{B}$ ) is linear

Plot of $P_{B}$ versus $x_{B}$ is linear

Plot of $p_{total}$ versus $x_{A}$ ( or $x_{B}$ ) is nonlinear

answer is D.

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Detailed Solution

From Raoult's Law, we know $P_{T} = P_{a}^{'} + P_{b}^{'}$

where, $P_{a}^{'} + P_{b}^{'} = X_{A} P_{a}^{0} + X_{B} P_{b}^{0}$

Also,

$\begin{array}{l} X_{A} + X_{B} = 1 \\ ∴ P_{T} = X_{A} [P_{a}^{\circ} - P_{b}^{\circ}] + P_{b}^{\circ} \end{array}$

$P_{T} {VsXA}_{A}$ is a linear plot.

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