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Question

The vapour pressure of a solution of two liquids, A (Po = 80 mm, X = 0.4) and B (Po = 120 mm, X = 0.6) is found to be 100 mm. It shows that the solution exhibits

Options

A.negative deviation from ideal behaviour.
B.positive deviation from ideal behaviour.
C.ideal behaviour.
D.positive deviation at lower concentration

Solution

$P_{\text{ideal}} = 0.4 \times 80 + 0.6 \times 120 = 104\text{ mm > 100 mm}$

⇒ Negative deviation

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