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Q.

If A and B are two components of an ideal solution. Y is molefraction in vapour phase. Total vapour pressure of an ideal solution is represented as Ps= 150 + 50 XA mm Hg at 25°C. at If XB = 0.4 then select the incorrect statement.

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a

YA > YB

b

YA > XA

c

YB > XB

d

P°A > P°B

answer is C.

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Detailed Solution

Ps=150+50xA If xA=1⇒xB=0 Ps=P0=200 mm HgXB = 1;XA = 0PS=PBo=150 mm Hg PS=PA+PB=PAoxA+PBoxBxA=0.6 and xB=0.4PS=200×0.6+150×0.4⇒ 120+60=180mmHgYA=PAPS=120180=0.66YB=0.34

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If A and B are two components of an ideal solution. Y is molefraction in vapour phase. Total vapour pressure of an ideal solution is represented as Ps= 150 + 50 XA mm Hg at 25°C. at If XB = 0.4 then select the incorrect statement.