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J & K CET Engineering J and K - CET Engineering 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. \[\because \]Relative lowering of vapour pressure \[=0.2\] \[\therefore \]Mole-fraction of the solute\[=0.2\]


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