J & K CET Medical J & K - CET Medical Solved Paper-2006

  • question_answer
    Relative lowering of vapour pressure of a dilute solution is 0.2. What is the mole fraction of the non-volatile solute?

    A)  0.8                                        

    B)  0.5

    C)  0.3                                        

    D)  0.2

    Correct Answer: D

    Solution :

                     According to Raoult's law the relative lowering in vapour pressure of an ideal solution containing the non-volatile solute is equal to the mole fraction of the solute. \[\therefore \]relative lowering of vapour pressure = 0.2 \[\therefore \]  mole-fraction of the solute = 0.2


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