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AIPMT 2000

MCQ (Single Correct Answer)
From the colligative properties of solution, which one is the best method for the determination of molecular weight of proteins and polymers?
A
Osmotic pressure
B
Lowering in vapour pressure
C
Lowering in freezing point
D
Elevation in boiling point

Explanation

Molecular masses of polymers are best determined by osmotic pressure method . Firstly because other colligative properties give so low values that they cannot be measured accurately and secondly, osmotic pressure measurements can be made at room temperature and do not require heating which may change the nature of the polymer.

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