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If 2 moles of A and 3 moles of B are mixed to form an ideal solution vapour pressure of A and B are 120 and 180 mm of Hg respectively, then the composition of A and B in the Vapour phase when the first traces of vapour are formed in the above case is

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a

X'A= 0.407

b

X'A= 0.8

c

X'A = 0.109

d

X'A = 0.307

answer is D.

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Detailed Solution

XA , XB are molefraction of A , B in liquid mixtureIn Vapour phase , according to Dalton's lawYA =mole fraction of A in vapour phase = X'A

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