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NEET Sample Paper NEET Sample Test Paper-12

  • question_answer
    A solution containing 10 g per dm3 of urea (molar mass = 60) is isotonic with a 5% (mass by vol.) solution of a non-volatile solute. The molar mass (in g\[mo{{l}^{-1}}\]) of non-volatile solute is

    A)  350

    B)  300

    C)  250

    D)  200

    Correct Answer: B

    Solution :

     For isotonic solutions of two non-electrolytes \[{{C}_{1}}={{C}_{2}}\] \[\therefore \]      \[\frac{10}{60\times 1000}=\frac{5}{M\times 100}\,\,\,(1\,d{{m}^{3}}={{10}^{3}}\,c{{m}^{3}})\] \[\therefore \]      \[m=300\,g\,mo{{l}^{-1}}\]


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