Multiple choice

The material used for bleaching paper pulp is ____.

  1. Chlorine

  2. Caustic Soda

  3. Sodium Hypochlorite

  4. Lime
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sodium hypochlorite (NaClO) is commonly used to bleach paper pulp, whitening it by oxidizing coloured impurities. Chlorine gas was historically used but sodium hypochlorite is safer and easier to handle. Caustic soda is used in pulping, not bleaching, and lime is used in recovery boilers.

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