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

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

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Chemical Process
Enzymes are

Proteins with high molecular weight (around 10, 000)
Derived from living organisms
Catalyst for temperature sensitive reactions
All of these

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