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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 use of bleaching powder. Chlorine gas is passed over dry slaked lime, Ca(OH)₂, to form bleaching powder, commonly represented at school level as calcium oxychloride, CaOCl₂. Chlorine is therefore the required gas. Hydrogen, carbon dioxide, and nitrogen do not provide the active bleaching constituent in this preparation. Hence option B is correct.

Related tags

Bleaching PowderChlorineSlaked LimeCalcium OxychlorideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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