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Biology miscellaneous
  1. Name the gas used in preparation of bleaching powder
    1. Oxygen
    2. Hydrogen
    3. Nitrogen
    4. Chlorine
Correct Option: D

Bleaching powder (CaOCl2) in manufactured by passing chlorine gas over dry slaked lime. Bleaching powder is also called calcium chlorohypochlorite because it is considered as a mixed salt of hydrochloric acid and hypochlorous acid.


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