The end bleaching agent used to move last traces of colour bodies from the pulp is ____________________?
Correct answer: C. Chlorine dioxide (ClO2)
- A. SO2 gas
- B. MgO
- C. Chlorine dioxide (ClO2)
- D. Mercaptans
Explanation
Chlorine dioxide is commonly used in the final bleaching stage because it removes the remaining colour-forming lignin residues while causing less fibre damage than elemental chlorine.
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