a) Sodium Hydroxide
b) Potassium Iodide
c) Hydrogen Peroxide
d) Sodium Disulphite
Answer: c
Explanation: Hydrogen Peroxide (H2O2) is the mostly used chemical for bleaching of chemical pulp. The reaction typically requires 3 h at 40°C and is followed by neutralization and destruction of excess peroxide with SO2. Peroxide bleaching allows brightness to be increased by nearly 20%.
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