Discussion
Match each bleaching agent with its characteristic condition or feature.
List I
A. Hydrogen peroxide
B. Sodium hypochlorite
C. Sodium chlorite
D. Sodium dithionite
List II
1. acidic conditions, corrosive and needs special plant
2. alkaline conditions, effluent free of chlorine
3. a reducing bleach used for wool and synthetics
4. mildly alkaline, cheap but forms chlorinated compounds
Answer: C
The first three are oxidising and the fourth is reducing, and each works under quite different conditions. Choosing between them turns on the fibre, the plant available and the effluent constraints. Only one of the four is a reducing agent.
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