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Which gas is passed over dry slaked lime in the preparation of bleaching powder?

Answer and explanation

Correct answer: Chlorine

Bleaching powder is prepared by passing chlorine gas over dry slaked lime, whose chemical formula is Ca(OH)₂. In simplified form, chlorine reacts with calcium hydroxide to produce bleaching powder along with other products. Therefore, option B is correct. Hydrogen and oxygen do not provide the required chlorinating action, while carbon dioxide reacts differently and is not used for this preparation. The lime must be dry so that the product forms properly.

Related tags

Bleaching-PowderChlorineSlaked-LimePreparationClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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