A) Osmotic pressure
B) Elevation of boiling point
C) Depression of freezing point
D) Relative lowering of vapour pressure
Correct Answer: A
Solution :
[a] 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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