7. Which of the following colligative properties can provide molar mass of protenis with greater precision

a. Relative lowering of vapour pressure

b. Elevation of boiling point

c. Depression in freezing point

d. Osmotic pressure

e. Rast’s method

Ans. d

Explanation : Osmotic pressure method is especially suitable for the determination of molecular masses of macro molecules such as protein & polymer because for these substances the values of other colligative properties such as elevation in boiling point or depression in freezing point are too small to be measured on the other hand osmotic pressure of such substance is measurable.