NEET Chemistry: Polymer Chemistry questions with solutions

Q1. The method preferred for determining the molecular weight of a polymer is

1. osmotic pressure
2. gas density
3. lowering of freezing point
4. direct weighing of a single molecule

Answer: osmotic pressure

Osmotic pressure is preferred for polymers because it is sensitive to the number of dissolved polymer molecules, even when their masses are very large. Gas density and freezing-point depression are less suitable for high-molar-mass polymers, and direct weighing of a single molecule is not practical.