JEE Main 2022 · 28 Jul · Shift 2 · Chemistry Q54

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ChemistryInteger+4 / -1Question 54 of 90

A gaseous mixture of two substances A and B, under a total pressure of 0.8 atm is in equilibrium with an ideal liquid solution. The mole fraction of substance A is 0.5 in the vapour phase and 0.2 in the liquid phase. The vapour pressure of pure liquid A is ______ atm. (Nearest integer)

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Answer and worked solution

Official answer: 2

Raoult and Dalton. $y_AP=x_AP_A^\circ$ : $0.5\times0.8=0.2P_A^\circ$ , so $P_A^\circ=2$ atm.

Answer: 2

Topics:Raoult's law and vapour pressure

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JEE Main 2022 · 28 Jul · Shift 2, Chemistry question 54