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10% (w/v) solution of sucrose (M.W = 342...

10% (w/v) solution of sucrose (M.W = 342) is isotonic with 5% (w/v) solution of a solute X under identical conditions. The molecular weight of X is

A

136.2

B

68.4

C

34.2

D

171.2

Text Solution

Verified by Experts

The correct Answer is:
B
For isotonic solutions,
`(w_(1))/(m_(1))=(w_(2))/(m_(2))implies(5)/(342)=(1)/(m_(2))impliesm_(2)=(342)/(5)=68.4`.
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