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# Which of the following colligative properties can provide molar mass of proteins (or polymers or colloids) with greater precision?

$\begin{array}{1 1}\text{Relative lowering of vapour pressure}\\\text{Elevation of boiling point}\\\text{Depression in freezing point}\\\text{Osmotic pressure}\end{array}$

Osmotic pressure measurement is used to determine molar mass of proteins or polymers or colloids