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Q.

A solution containing 10g per dm3 of urea (molecular mass = 60g mol−1) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this non-volatile solute is 

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a

350 g mol−1

b

200 g mol−1

c

250 g mol−1

d

300 g mol−1

answer is B.

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Detailed Solution

Isotonic means osmotic pressures are equal.

∴   π1=π2n1v1RT=n2v1RTw1m1RTV1=w2m2RTV21060×11000=5m2×1100∴m2=300g mol−1

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