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Q.

A 5.25% solution of a substance is isotonic With a 1.5% solution of urea (molar mass = 60 g moI-1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm-3, molar mass of the substance will be :

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a

210.0 g mol−1

b

105.0 g mol−1

c

90.0 g mol−1

d

15.0 g mol−1

answer is B.

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Detailed Solution

The molar mass of the substance,

5.25M=1.560 ⇒M=210

Thus, the correct option is B.

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