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Q.

At 35ºC, the vapour pressure of CS2, is 512 mm Hg and that of acetone is 344mm Hg. A solution of CS2 in acetone has a total vapour pressure of 600mm Hg. The false statement amongst the following is:

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a

CS2 and acetone are less attracted to each other than to themselves

b

heat must be absorbed in order to produce the solution at 35ºC

c

Raoult’s law is not obeyed by this system

d

a mixture of 100 mL CS2and 100 mL acetone has a volume of <200 mL

answer is D.

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Detailed Solution

A mixture of acetone and CS2 exhibits positive deviation from ideal behaviour. This should lead toΔVmix=+ve . So option (d) is incorrect
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