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Which gas is used to prepare bleaching powder?

Answer and explanation

Correct answer: Chlorine

The governing concept is the preparation and chemical use of bleaching powder. Chlorine gas is passed over dry slaked lime, Ca(OH)₂, to produce bleaching powder, commonly represented at school level as CaOCl₂. Chlorine also explains its bleaching and disinfecting action. Thus option B is correct. Hydrogen and nitrogen do not provide the required active chlorine, while carbon dioxide is not the gas used in this preparation.

Related tags

Bleaching PowderChlorineChemical PreparationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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