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At constant temperature, binary ideal solution is formed by two liquids A and B. At equilibrium, mole-fraction of liquid B is 0.4 and vapour state mole-fraction of B is 0.25. P°B = 40 mm, then at the same temperature, what will be the vapour pressure of pure liquid ‘A’ ?

(a)  80 mm

(b)  60 mm

(c)  40 mm 

(d)  50 mm

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Best answer

Correct option  (a) 80 mm

Explanation:

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