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NEET levelSingle correct optionDifficulty 1 of 3so020

For an ideal solution formed from two liquids, which pair of conditions holds?

A $Δ H_{mix} > 0$ and $Δ V_{mix} > 0$
B $Δ H_{mix} = 0$ and $Δ V_{mix} = 0$
C $Δ H_{mix} < 0$ and $Δ V_{mix} < 0$
D $Δ H_{mix} = 0$ and $Δ V_{mix} > 0$

Answer: B

In an ideal solution the A-B interactions equal the A-A and B-B interactions on average. So there is no heat change and no volume change on mixing:

Δ H_{mix} = 0

and

Δ V_{mix} = 0

.

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