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1.Solution and Colligative properties
medium
If vapour pressures of pure liquids $‘A’$ and $‘B’$ are $300$ and $800\, torr$ respectively at $25\,^oC$. When these two liquids are mixed at this temperature to form a solution in which mole percentage of $‘B’$ is $92$, then the total vapour pressure is observed to be $0.95\, atm$. Which of the following is true for this solution.
A
$\Delta V_{mix} > 0$
B
$\Delta H_{mix} < 0$
C
$\Delta V_{mix} = 0$
D
$\Delta H_{mix} = 0$
Solution
$P_S < P_A + P_B$ (on calculating) hence $P_A + P_B = 760\,mm$
$\therefore $ it shows negative deviation
Standard 12
Chemistry
