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The method preferred for determining the...

The method preferred for determining the molecular weight of polymer is:

A

Osmotic pressure

B

Gas density

C

Lowering of freezing point

D

Direct weighing of a single molecule

Text Solution

Verified by Experts

The correct Answer is:
A

Osmotic pressure method is best for the determination of molecular weight of polymers and proteins since O.P. though very small, is measurable and in this method, heating is not required.
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Colligative properties can be used to determine the molecular mass of solutes in solutions. For determining the molecular mass of polymers, osmotic pressure is preffered to other properties. Why ?

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Knowledge Check

  • Polymers are

    A
    Micromolecules
    B
    Macromolecules
    C
    Sub- micromolecules
    D
    none of the above
  • Assertion : Equal moles of helium and oxygen gases are given equal quantities of heat at constant volume. There will be greater rise in the temperature of helium compared to that of oxygen. Reason : The molecular weight of oxygen is greater than the molecular weight of helium.

    A
    If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
    B
    If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
    C
    If Assertion is true but Reason is false.
    D
    If both Assertion and Reason are false.
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