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Question

At a given temperature, the vapour pressure in mm of Hg of a solution of two volatile liquids A & B is given by the equation:

P=12080 XB (Where XB is molefraction of B)

Vapour pressures of pure A & B at the same temperature are respectively:

A
120, 80
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B
120, 200
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C
120, 40
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D
80, 40
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Solution

The correct option is C 120, 40
When xB=0 we have only pure A

P0A=120(80×0)=120mm

The given expression P=12080 XB can also be written as

P=12080(1XA)[XA+XB=1]

If XA=0, we have only pure B

P0B=12080(10)=40mm

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