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JEE Main levelSingle correct optionDifficulty 2 of 3pl053

Osmometry (a colligative method) and light scattering are used to measure molar mass of polymers. They give, respectively,

A $M_{w}$ and $M_{n}$
B $M_{n}$ and $M_{w}$
C $M_{n}$ and $M_{n}$
D $M_{w}$ and $M_{w}$

Answer: B

Colligative properties count the number of chains, so they give the number-average

M_{n}

. Light scattering intensity depends on mass squared and gives the weight-average

M_{w}

.

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