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To prepare bleaching powder, chlorine is passed over which substance?

Answer and explanation

Correct answer: Dry slaked lime

Bleaching powder is prepared by passing chlorine over dry slaked lime, whose chemical formula is Ca(OH)₂. The relevant reaction is commonly represented as Ca(OH)₂ + Cl₂ → Ca(OCl)Cl + H₂O. Therefore option A is correct. Common salt is used in the chlor-alkali process, gypsum forms plaster of Paris on heating, and washing soda is sodium carbonate; none is the direct solid used here.

Related tags

Bleaching PowderChlorineDry Slaked LimeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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