JEE Main 2026 — Solutions Question with Solution
JEE Main 2026 (24 January Shift 2)
Question
Two liquids A and B form an ideal solution at temperature T K. At T K, the vapour pressures of pure A and B are 55 and respectively. What is the mole fraction of in solution of and in equilibrium with a vapour in which the mole fraction of A is 0.8 ?
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Show full solutionCorrect option: C
Correct answer
C0.5217
Step-by-step explanation
For an ideal solution with Raoult's law, the partial pressure of A in vapour is where is the mole fraction in vapour phase. Thus kNm.
Using the equilibrium condition where is mole fraction in liquid and :
Using the equilibrium condition where is mole fraction in liquid and :
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This is a previous-year question from JEE Main 2026, covering the Solutions chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.