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Q.

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

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a

Raoult’s law is not obeyed by this system

b

a mixture of 100mL CS2 and 100mL acetone has a volume of < 200 mL

c

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

d

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

answer is D.

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Detailed Solution

Positive deviation from Raoult's law is observed maximum value of pressure is less than the pressure observed, thus intramolecular forces and interactions are stronger than intermolecular interactions.

Vmix>0, Hmix>0
Hence, correct option is: (D) a mixture of 100mL CS2 and 100mL acetone has a volume of 200mL

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