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-$II$ (Used in Making)
$A$. Urea-formaldehyde resin	$I$. Safety Helmets
$B$. Glyptal	$II$. Gaskets
$C$. Bakelite	$III$. Laminated sheets
$D$. Nylon-$6,6$	$IV$. Commercial fibres
$E$. Phenol-formaldehyde	$V$. Paints

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

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Match the following:
List-$I$ (Polymer) List-$II$ (Used in Making)
$A$. Urea-formaldehyde resin $I$. Safety Helmets
$B$. Glyptal $II$. Gaskets
$C$. Bakelite $III$. Laminated sheets
$D$. Nylon-$6,6$ $IV$. Commercial fibres
$E$. Phenol-formaldehyde $V$. Paints

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