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Polydispersity index is defined as ______ where M_w and M_n are the weight average and number average molecular masses respectively.

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M_w x M_n

M_w/M_n

M_n/M_w

M_w – M_n

answer is B.

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Detailed Solution

Polydispersity index (PDI) is defines as the ratio of weight average molecular mass to the number average molecular mass. It gives an idea of the homogeneity of the polymer.

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