A binary liquid (AB) shows positive deviation from Raoult's law when:

P_{A} > P_{A}^{o} χ_{A}^{l i q u i d}

and

P_{B} > P_{B}^{o} χ_{B}^{l i q u i d}

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Intermolecular forces

A - A, B - B > A - B

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Δ V_{m i x} > 0

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Δ H_{m i x} > 0

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Solution

The correct option is C $Δ V_{m i x} > 0$
In positive deviation from Raolt's Law, the resulting solution has more vapour presence than the ideal solution of the constituent liquids. This is because the A-B interactions are weaker than A-A & B-B ones. Also, absorption of heat takes place in this case, due to which, $Δ H_{m i x} > 0$ . The volume of the resulting solution also increases, hence $Δ V_{m i x} > 0$ .

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Question 21
On the basis of information given below mark the correct option.
Information
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