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InterviewSolution
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A 5.25% solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g `mol^(-1)`) in the same solvent. If the densities of both solutions are assumed to be equal to `1.0 g cm^(-3)`, molar mass of the substance will beA. `90.0 g mol^(-1)`B. `115.0 g mol^(-1)`C. `1050.0 g mol^(-1)`D. `210.0 g mol^(-1)` |
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Answer» Correct Answer - D Solutions with the same osmotic pressure are isotonic Let the molar mass of the substances be M `pi = C_(1)RT=C_(2)RT=pi_(2)` So, `C_(1)=C_(2)` As density of the solutions are same So, `(5.25)/(M)=(15)/(60)rArr M =(5.25xx60)/(1.5)=210` |
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