Q.

Consider a binary mixture of volatile liquids. If at Xa = 0.2, the vapour pressure of solution is 580 torr, then the mixture could be(P°A =200 torr, P°B = 600 torr)

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a

CHCl3 + CH3 COCH3

b

C2H5OH+ Hexane

c

H2O + HNO3

d

n-C6 H14 +n-C7 H16

answer is B.

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Detailed Solution

P(ideal )=0.2×200+0.8×600=520 torr 
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Consider a binary mixture of volatile liquids. If at Xa = 0.2, the vapour pressure of solution is 580 torr, then the mixture could be(P°A =200 torr, P°B = 600 torr)