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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 300
Molar concentration of urea solution =16, as 10g per d/m of urea solution, molecular mass =60g/mol

Molar concentration of 5% non - volatile solute

=50 g/dm3Mol.weight of nonvolatile solute

=50Mm

Both solutions are isotonic to each other, therefore,

16=50m

m=6×50=300

Option B is correct.

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