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NEET Sample Paper NEET Sample Test Paper-54

  • question_answer
    A solution containing \[10g\text{ }per\text{ }d{{m}^{3}}\] of urea \[\left( molecular\text{ }mass\text{ }=\text{ }60g\text{ }mo{{l}^{-1}} \right)\] is isotonic with a \[5%\] solution of a nonvolatile solute. The molecular mass of this nonvolatile solute is-

    A) \[250g\text{ }mo{{l}^{-}}^{1}\]                     

    B) \[300g\text{ }mo{{l}^{-}}^{1}\]

    C) \[350g\text{ }mo{{l}^{-}}^{1}\]                     

    D) \[200g\text{ }mo{{l}^{-}}^{1}\]

    Correct Answer: B

    Solution :

    \[\frac{{{W}_{1}}}{{{M}_{1}}{{V}_{1}}}\,\,=\,\,\frac{{{W}_{2}}}{{{M}_{2}}{{V}_{2}}}\] \[\frac{10}{60\times 1000}\,\,=\,\,\frac{5}{{{M}_{2}}\times 100}\] \[{{M}_{2}}=300\text{ }g/mol\]


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