Discussion
Assertion (A): Bleaching demand is estimated from the kappa number of the unbleached pulp.
Reason (R): The number measures the residual lignin, which is what the bleaching chemicals attack.
Answer: D
Both are true and the reason gives the connection: cooking to a lower kappa costs yield, so the mill trades cooking against bleaching to reach the brightness it needs at least cost. Cooking too hard damages the fibres as well.
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