5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is t

Question

5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?NEET 2025

TestHub · Accepted Answer

X n x ​ = 5 P x 0 ​ = 63 ​ Y n y ​ = 10 P y 0 ​ = 78 ​ ​ ​ P s ( calc.) ​ = P x 0 ​ x x ​ + P y 0 ​ X y ​ = 15 63 × 5 ​ + 78 × 15 10 ​ = 21 + 52 = 73 P s (obs.) ​ = 70 P s (obs.) ​ < P s (calc.) ​ ​ -ve deviation ​

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