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

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

Raoult’s law is not obeyed by this system

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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