JEE Mains · Chemistry · STD 12 -1. Solution and colligative properties
At \(35^{\circ} \mathrm{C},\) the vapour pressure of \(\mathrm{CS}_{2}\) is \(512\; \mathrm{mm}\) Hg and that of acetone is \(344\; \mathrm{mm}\) Hg. \(\mathrm{A}\) solution of \(\mathrm{CS}_{2}\) in acetone has a total vapour pressure of \(600\; \mathrm{mm}\; Hg\). The false statement amongst the following is
- A heat must be absorbed in order to produce the solution at \(35^oC\)
- B Raoult's law is not obeyed by this system
- C a mixture of \(100\; mL\; CS_2\) and \(100\; mL\) acetone has a volume \(< 200 \;mL\)
- D \(CS_2\) and acetone are less attracted to each other than to themselves
Answer & Solution
Correct Answer
(C) a mixture of \(100\; mL\; CS_2\) and \(100\; mL\) acetone has a volume \(< 200 \;mL\)
Step-by-step Solution
Detailed explanation
The vapour pressure of mixture \((=600\; \mathrm{mm} \;\mathrm{Hg}\) ) is greater than the individual vapour pressure of its constituents (Vapour pressure of \(\mathrm{CS}_{2}=512\; \mathrm{mm}\; Hg\), acetone \(=344 \;\mathrm{mm}\; Hg\) ). Hence, the solution formed shows…
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