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Q.

At 350K, vapour pressures of pure liquids A & B are 450 & 700 mm Hg respectively. If the total pressure of solution of A & B at the same temperature is 600 mm Hg, the ratio of moles of A & B in vapour phase is      

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a

3 : 4

b

3 : 7

c

2 : 3

d

3 : 5

answer is D.

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Detailed Solution

P=PA0XA+PB0XB→(XA,XB→in   solution)

PA0XA=600xYA(vapour  phase),PB0XB=600xYB

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