Chemical Process
The main aim behind cooling the digested chip at the bottom portion of the digestor by injecting cold black liquor is to

Increase the cellulose content
Avoid mechanical weakening of fibre
Remove lignin by way of crystallisation
None of these

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Chemical Process
Nylon 66 is so named because the

Number of nitrogen atoms between two carbon atoms are 6
Number of carbon atoms between two nitrogen atoms are 6
Polymer was first synthesised in 1966
Average degree of polymerisation of the polymer is 1966

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