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Question

The vapour pressure of pure benzene and toluene at a particular temperature are 100 mm and 50 mm respectively. Then the mole fraction of benzene in vapour phase in contact with equimolar solution of benzene and toluene is :

A
0.67
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B
0.75
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C
0.33
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D
0.50
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E
0.20
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Solution

The correct option is A 0.67
Total vapour pressure, ptotal=p1+p2
=100+50
=150 mm

Mole fraction of benzene in solution,

x=p1p1+p2

=100150=23=0.67

Therefore, the correct option is A.

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