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JEE Main & Advanced Chemistry Solutions / विलयन Question Bank Abnormal molecular mass

  • question_answer
    Dry air was passed successively through a solution of \[5\,gm\] of a solute in \[80gm\] of water and then through pure water. The loss in weight of solution was \[2.50\,gm\] and that of pure solvent \[0.04\,gm\]. What is the molecular weight of the solute [MP PMT 1986]

    A)                 70.31

    B)                 7.143

    C)                 714.3     

    D)                 80

    Correct Answer: A

    Solution :

                \[m=\frac{5\times 18\times 2.5}{0.04\times 80}=70.31\]              


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