An ideal solution is formed by mixing two volatile liquids A and B. XA and XB are the mole fractions of A and B respectively in the solution and Yo and Y, are the mole fractions of A and B respectively in the vapour phase. A plot of 1YAalong y-axis against, along x-axis gives a 1XAstraight line. What is the slope of the straight line ?

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PB∘PA∘

PA∘PB∘

PB∘−PA2

PA∘−PB∘

answer is A.

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Detailed Solution

yA=PA∘xAPA∘xA+PB∘xB=PA∘xAPB∘+PA∘−PB∘xA 1yA=PB∘xB+PA∘xAPA∘xA=1+PB∘PA∘1−xAxA =1−PB∘PA∘+1xAPB∘PA∘ ∴ Slope =PB∘PA∘

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