a) Calcium propionate
b) Calcium carbonate
c) Sodium nitrate
d) Sodium sulfite
Answer: d
Explanation: Chemithermomechanical pulping (CTMP) pulps are obtained by a comparatively mild chemical treatment followed by pressurized refining. Sodium sulfite is used for the mild chemical pretreatment. It increases the strength properties of TMP pulps even further.
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