NEET 2000 Chemistry question

From the colligative properties of solution which one is the best method for the determination of mol. wt of proteins & polymers :

(1)Osmotic pressureCorrect
(2)Lowering in V.P.
(3)Lowering is freezing point
(4)Elevation in B.Pt.

Answer: (1)

Solution

Proteins and polymers have very large molar masses, so even a reasonably concentrated solution contains a very small mole fraction/molality of solute. The vapour pressure lowering, freezing point depression and boiling point elevation are then far too small to measure

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Question ID VK-088630