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JEE Main levelOne or more correct optionsDifficulty 2 of 3pl142

Select all the correct statements.

A $M_{n}$ is always greater than $M_{w}$
BPDI equals 1 only if all chains in the sample have the same molar mass
CLight scattering gives the number-average molar mass $M_{n}$
D $M_{w} \geq M_{n}$ for every sample

Answer: B, D

PDI

= M_{w} / M_{n}

is exactly 1 only for a monodisperse sample; otherwise

M_{w} > M_{n}

. Light scattering gives

M_{w}

, not

M_{n}

.

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