Q67 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Polymer Chemistry – General · Marks: 2 · Difficulty: Medium

For a monodisperse polymer, the number-average molar mass $\left(\overline{\mathrm{M}}_{\mathrm{N}}\right)$ and weight-average molar mass $\left(\overline{\mathrm{M}}_{\mathrm{w}}\right)$ are related according to
(a)$\overline{\mathrm{M}}_{\mathrm{w}}<\overline{\mathrm{M}}_{\mathrm{N}}$
(b)$\overline{\mathrm{M}}_{\mathrm{w}}=\overline{\mathrm{M}}_{\mathrm{N}}$
(c)$\overline{\mathrm{M}}_{\mathrm{w}}>\overline{\mathrm{M}}_{\mathrm{N}}$
(d)$\overline{\mathrm{M}}_{\mathrm{w}}<\log \overline{\mathrm{M}}_{\mathrm{N}}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
For a monodisperse polymer every chain has the same mass, so M̄w = M̄ₙ (b).

Study loop for Polymer Chemistry

1. Practise the PYQsPrevious-year questions, with answers

· Browse this chapter in the app