If two substances A and B have p∘A:p∘B=1:2 and mole fraction in solution = 1 : 2 then mole fraction of A in vapours is

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0.33

0.25

0.52

0.2

answer is D.

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Detailed Solution

Mole fraction of component A in vapour phase = Partial pressure of A Total vapour pressure =pApA+pBBut pA=pA∘xA and pB=pB∘xB∴Mole fraction of A in vapour phase =pA∘xAp∘xA+pB∘xBGiven, pA∘=1,xA=1,pB∘=2,xB=2On substituting the values, we get Mole fraction of component A in vapour phase=1×11×1+2×2=11+4=15=0.2

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