JEE PYQ: Solutions And Colligative Properties Question 26
Question 26 - 2019 (08 Apr Shift 1)
The vapour pressures of pure liquids A and B are 400 and 600 mmHg, respectively at 298 K. The mole fraction of liquid B is 0.5 in the mixture. The vapour pressure, mole fractions of A and B in vapour phase are:
(1). (450 mmHg, 0.4, 0.6)
(2). (500 mmHg, 0.5, 0.5)
(3). (450 mmHg, 0.5, 0.5)
(4). (500 mmHg, 0.4, 0.6)
Show Answer
Answer: (4)
Solution
$P = 0.5 \times 400 + 0.5 \times 600 = 500$ mmHg. $y_A = 200/500 = 0.4$, $y_B = 300/500 = 0.6$.
BETA
