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Question

# A solution containing 10g per d/m of urea( molecular mass=60g/mol) is isotonic with a 5%solution of non volatile solute. The molecular mass of this non volatile solute is

A
250
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B
300
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C
350
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D
200
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Solution

## The correct option is B 300Molar concentration of urea solution =16, as 10g per d/m of urea solution, molecular mass =60g/molMolar concentration of 5% non - volatile solute =50 g/dm3Mol.weight of non−volatile solute=50MmBoth solutions are isotonic to each other, therefore,16=50mm=6×50=300Option B is correct.

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