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Which gas reacts with slaked lime to make bleaching powder?

Answer and explanation

Correct answer: Chlorine

Bleaching powder is prepared by passing chlorine gas over dry slaked lime, calcium hydroxide. The reaction is commonly represented as Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O, although the product may contain related calcium compounds depending on conditions. Thus chlorine is the required gas and option A is correct. Hydrogen, oxygen, and nitrogen do not provide the characteristic chlorinating and disinfecting product, so options B, C, and D are unsuitable.

Related tags

ScienceClass 10Acids Bases SaltsBleaching PowderChlorineAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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