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Question

At 80C the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liq ‘B’ is 1000 mm Hg. If a mixture of both the liquids form an ideal solution which boils at 80C and 1 atm pressure, the mole fraction of ‘A’ in the liquid mixture is:


A
0.4
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B
0.2
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C
0.5
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D
0.8
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Solution

The correct option is C 0.5

PAXA+PBXB=Pmix(520)XA+(1000)(1XA)=760520XA1000XA=7601000480XA=240XA=12=0.5


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