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Q.

Two liquids A and B have vapour pressure in the ratio PA∘:PB∘=1:3at a certain temperature. Assume A and B form an ideal solution and the ratio of mole fractions of A to B in the vapour phase is 4 : 3. Then the mole fraction of B in the solution at the same temperature is :

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a

15

b

23

c

45

d

14

answer is A.

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Detailed Solution

yA=PAP⇒PA∘xAP and yB=PB∘xBP yAyB=PA∘PB∘×xAxB⇒43=13×xA1−xA xA=45  or  xB=15
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