Two liquids X and Y form an ideal solution. The mixture has a vapour pressure of $$400$$ mm at $$300$$ K when mixed in the molar ratio of $$1$$ : $$1$$ and a vapour pressure of $$350$$ mm when mixed in the molar ratio of $$1$$ : $$2$$ at the same temperature. The vapour pressures of the two pure liquids X and Y respectively are

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Ideal sol. (1)                                                        Ideal sol. (2)   $$Ptot=400mm$$                                                          $$Ptot=350nA$$:nB $$=1$$:$$1$$                                                             nA:nB $$=1$$:$$2XA=1/2$$ , $$XB=1/2$$                                                       $$XA=1/3$$ , $$XB=2/3$$                                                                                                             By solving (1) & (2)  ;    we get

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