JEE Main 2005 — Solutions Question with Solution
From: AIEEE 2005
Question
Benzene and toluene form nearly ideal solutions. At 20 oC, the vapour pressure of
benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of
benzene at 20 oC for a solution containing 78 g of benzene and 46 g of toluene in
torr is
Choose an option
Show full solutionCorrect option: A
Correct answer
A50
Step-by-step explanation
Given, Vapour pressure of benzene
Vapour pressure of toluene
mass of benzene in
hence moles of benzene
(mol. wt of benzene )
mass of toluene in solution
hence moles of toluene
Total moles of benzene and toluene = 1.5 mol
now partial pressure of benzene
torr
Vapour pressure of toluene
mass of benzene in
hence moles of benzene
(mol. wt of benzene )
mass of toluene in solution
hence moles of toluene
Total moles of benzene and toluene = 1.5 mol
now partial pressure of benzene
torr
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This is a previous-year question from JEE Main 2005, 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.