JEE PYQ: Solutions And Colligative Properties Question 21
Question 21 - 2020 (07 Jan Shift 1)
At 35°C, the vapour pressure of $\text{CS}_2$ is 512 mm Hg and that of acetone is 344 mm Hg. A solution of $\text{CS}_2$ in acetone has a total vapour pressure of 600 mm Hg. The false statement is:
(1). (Raoult’s law is not obeyed by this system)
(2). (a mixture of 100 mL $\text{CS}_2$ and 100 mL acetone has a volume < 200 mL (FALSE))
(3). ($\text{CS}_2$ and acetone are less attracted to each other than to themselves)
(4). (heat must be absorbed in order to produce the solution at 35°C)
Show Answer
Answer: (2)
Solution
Positive deviation from Raoult’s law means $\Delta V_{\text{mix}} > 0$, so volume > 200 mL. Statement (2) is false.
BETA
