a) Sodium Nitrate
b) Potassium Hydroxide
c) Calcium Carbonate
d) Sodium Hydroxide
Answer: d
Explanation: All chemical pulping methods are based, either directly or indirectly, on the use of sodium hydroxide. The chemical is selectively chosen, because, the nature of the pulping chemicals influences the properties of the residual lignin and the residual carbohydrates.
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