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Q.

The Novolac polymer has mass of 963 gm. The number monomer units present in it is ____ 

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answer is 9.

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Detailed Solution

Monomer of Novolac is  Question Image Molecular weight of this monomer is 124 gm

 Mol.wt of polymer = 963 gm 

In during formation of Novalac polymer

(n−1) units of water are removed

n×124=963+[16×(n−1)]⇒n=9

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