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Why does bleaching powder lose effectiveness when kept in a moist open place?

Answer and explanation

Correct answer: Available chlorine may decrease

Bleaching powder, commonly represented as CaOCl2, works mainly because it releases available chlorine, which provides oxidising and disinfecting action. In a moist, open environment it may undergo decomposition and react with moisture and carbon dioxide, so the amount of available chlorine decreases over time. Consequently its bleaching and disinfecting power falls. Therefore option A is correct, and it should be stored in a dry, tightly closed container.

Related tags

Bleaching PowderAvailable ChlorineChemical StorageAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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