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Questions  

At 40oC, the vapour pressure of pure liquids,benzene and toluene, are 160 mmHg and 60 mmHg respectively. At the same temperature, the vapour pressure of an equimolar solution of the two liquids, assuming the ideal solution should be 

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By Expert Faculty of Sri Chaitanya
a
140 mmHg
b
110 mmHg
c
220 mmHg
d
100 mmHg

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detailed solution

Correct option is B

For ideal solution, ptotal =p1∘x1+p2∘x2         =160×12+60×12=110mmHg
ctaimg

ctaimg

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Vapour pressure of pure A is 70 mm of Hg at 25oC.It forms an ideal solution with 'B' in which mole fraction of A is 0.8. If the vapour pressure of the solution is 84 mm of Hg at 25oC the vapour pressure of pure B at 25oC is

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