A) \[300\,g\,mo{{l}^{-1}}\]
B) \[350\text{ }g\text{ }mo{{l}^{-1}}\]
C) \[200g\,mo{{l}^{-1}}\]
D) \[250g\,mo{{l}^{-1}}\]
Correct Answer: A
Solution :
Suppose the molecular mass of non volatile solute is M Molar cone. of urea solution \[=\frac{10}{60}\text{ }per\text{ }d{{m}^{3}}\] Molar cone. of non volatile solute solution \[=\frac{5}{M}\text{ }per\text{ }100\text{ }mL\] \[=\frac{50}{M}per\text{ }d{{m}^{3}}\] For isotonic solution at the same temperature molar concentration are equal \[\frac{10}{60}=\frac{50}{M}\] or \[M=300g\,mo{{l}^{-1}}\]
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