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Polymers — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryPolymers1 Mark
MCQ
The method preferred for determining the molecular weight of a polymer is $.........$
  • ✓
    Osmotic pressure
  • B
    Gas density
  • C
    Lowering of freezing point
  • D
    Direct weighing of a single molecule
✓

Answer

Correct option: A.
Osmotic pressure
Osmotic pressure method is the best method for the determination of molecular weight of polymers and proteins, since osmotic pressure, though very small, is measurable.
On the other hand, in other colligative properties $\ce{(\triangle Tb​, \triangle Tf​, \triangle p/po)},$ the difference is very small and cannot be measured.
Morever, in osmotic pressure method, heating is not required. While in other methods, heating is required which changes the properties of polymers and proteins.

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