Q28 / 160 · AP EAMCET 2010 · Chemistry

If the number average molecular weight and weight average molecular weight of a polymer are 40000 and 60000 respectively, the polydispersity index of the polymer will be

  • Correct answer
    A
    $>1$
  • B
    $ < 1$
  • C
    1
  • D
    zero

Solution

Polydispersity index, $\mathrm{PDI}=\frac{\bar{M}_w}{\bar{M}_n}$ where, $\bar{M}_w=$ weight average molecular weight $\bar{M}_n=$ number average molecular weight $\mathrm{PDI}=\frac{60000}{40000}=1.5$ ie, $\quad>1$

Hence, the correct answer is option: 'A'.

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