Two liquids X and Y form an ideal solution. At 300K, vapour pressure of the solution containing

1 mol of X and 3 mol of Y is 550 mm Hg. At the same temperature, if 1 mol of Y is further

added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure

(in mmHg) of X and Y in their pure states will be, respectively :-

  1.  400 and 600

  2.  500 and 600

  3.  200 and 300

  4. 300 and 400

Correct Option: 1


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