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Which of the following colligative property can provide molar mass of proteins (or polymers or colloids) with greatest precision?

1. Osmotic pressure
2. Elevation of boiling point
3. Depression of freezing point
4. Relative lowering of vapour pressure

Correct answer: Osmotic pressure

Solution

Osmotic pressure is highly sensitive to small changes in solute concentration, making it the most precise colligative property for determining the molar mass of macromolecules like proteins or polymers.

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