Why osmotic pressure is more widely used for determining molar masses of macromolecules than any other colligative property?

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Chemistry - Board Papers

Set-I

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Give reasons for the following :a Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers.b Aquatic animals are more comfortable in cold water than in warm water.c Elevation of boiling point of 1 M KCI solution is nearly double than that of 1 M sugar solution.