The Novolac polymer has a mass of 963 g. The | vedclass

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(C) The monomer unit of Novolac is $o$-hydroxybenzyl alcohol (saligenin),which has the chemical formula $C_7H_8O_2$.The molecular mass of the monomer

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$9$

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(C) The monomer unit of Novolac is $o$-hydroxybenzyl alcohol (saligenin),which has the chemical formula $C_7H_8O_2$.The molecular mass of the monomer unit is $(7 	imes 12) + (8 	imes 1) + (2 	imes 16) = 84 + 8 + 32 = 124 \ g/mol$.Novolac is formed by the condensation polymerization of phenol and formaldehyde,where water molecules are eliminated.For a polymer chain consisting of $n$ monomer units,$(n-1)$ molecules of water are removed.The mass of the polymer is given by: $Mass_{polymer} = (n 	imes Mass_{monomer}) - ((n-1) 	imes Mass_{water})$.Substituting the given values: $963 = (n 	imes 124) - ((n-1) 	imes 18)$.$963 = 124n - 18n + 18$.$963 - 18 = 106n$.$945 = 106n$.$n = 945 / 106 \approx 8.91$.Rounding to the nearest integer,the number of monomer units $n = 9$.

List-$I$ Polymer	List-$II$ Type/Class
$A$. Nylon-$2$-Nylon-$6$	$I$. Thermosetting Polymer
$B$. Buna-$N$	$II$. Biodegradable polymer
$C$. Urea-formaldehyde	$III$. Synthetic rubber
$D$. Dacron	$IV$. Polyester

The Novolac polymer has a mass of $963 \ g$. The number of monomer units present in it is $......$

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Match List-$I$ with List-$II$:

List-$I$ Polymer List-$II$ Type/Class

$A$. Nylon-$2$-Nylon-$6$ $I$. Thermosetting Polymer

$B$. Buna-$N$ $II$. Biodegradable polymer

$C$. Urea-formaldehyde $III$. Synthetic rubber

$D$. Dacron $IV$. Polyester

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