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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pl038

Which statements about molar mass averages of polymers are correct?

AMembrane osmometry gives the number-average molar mass
BLight scattering gives the weight-average molar mass
C $M_{w}$ can be smaller than $M_{n}$ for a polydisperse sample
DA sample of identical chains has PDI equal to 1

Answer: A, B, D

Colligative methods measure

M_{n}

and light scattering measures

M_{w}

. Since

M_{w} \geq M_{n}

for any sample, statement 3 is false; identical chains give

M_{w} = M_{n}

.

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