42. At

80° C the vapour pressure of pure liquid ‘A’ is 520 mmHg and that of pure liquid ‘B’ is 1000 mmHg. If a mixture of solution ‘A’ and ‘B’ boils at 80° C and 1 atm pressure the amount of ‘A’ in the mixture is

a. 34 mol percent

b. 48 mol precent

c. 50 mol precent

d. 52 mol precent

Ans. c

(8)