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Q.

A solution containing 10 g per dm² of urea ( molecular mass = 60 g mol^-1) is isotonic with a 5% solution of a nonvolatile solute. The molecular mass of this nonvolatile solute is

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a

200g $m o l^{- 1}$

b

300 g $m o l^{- 1}$

c

350g $m o l^{- 1}$

d

250g $m o l^{- 1}$

answer is D.

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Detailed Solution

$C_{1} R T = C_{2} R T$ ( $C_{1}$ and $C_{2}$ in mole/litre )

$\frac{10}{60} = \frac{50}{m} \Rightarrow m = 300$

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