At $35^{\circ} \mathrm{C}$, the vapour pressure of $\mathrm{CS}_2$ is 512 mm Hg and that of acetone is 344 mm Hg . A solution of $\mathrm{CS}_2$ in acetone has a total vapour pressure of 600 mm Hg. The false statement amongst the following is
Select the correct option:
A
Raoult’s law is not obeyed by this system
B
A mixture of 100 mL CS 2 and 100 mL acetone has a volume $<200 \mathrm{~mL}$
C
Heat must be absorbed in order to produce the solution at $35^{\circ} \mathrm{C}$
D
$\mathrm{CS}_2$ and acetone are less attracted to each other than to themselves
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Since the vapour pressure of the solution is greater than individual vapour pressure of both pure components, the solution shows a positive deviation from Raoult’s law.
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