a) 20–30
b) 30–40
c) 10–20
d) 18–20
Answer: d
Explanation: The kappa number of bleachable hardwood pulps is 18–20. This indicates that hardwood pulp has lower lignin content than softwood pulp. Lignin does not have fiber forming properties, hence, hardwood pulp does not make as strong paper as softwood pulp.
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