Q60 · CSIR-NET Chemistry, December 2018
Paper: CSIR-NET December 2018 · Subject: Physical Chemistry · Chapter: Polymer Chemistry · Topic: Polymer Chemistry – General · Marks: 2 · Difficulty: Easy
The dispersity of a polymeric sample is
(a)$\frac{\left\langle\mathrm{M}^{2}\right\rangle}{\langle\mathrm{M}\rangle^{2}}$
(b)$\frac{\langle\mathrm{M}\rangle^{2}}{\left\langle\mathrm{M}^{2}\right\rangle}$
(c)$\frac{\langle\mathrm{M}\rangle^{2}}{\langle\mathrm{M}\rangle}$
(d)$\frac{\langle\mathrm{M}\rangle}{\langle\mathrm{M}\rangle^{2}}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Dispersity Đ = M_w/M_n = ⟨M²⟩/⟨M⟩² (with the number-based averages).
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