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Why can the effectiveness of bleaching powder decrease when it is kept exposed to air for a long time?

Answer and explanation

Correct answer: It can slowly lose available chlorine

Bleaching powder is useful because it contains available chlorine, which is released during suitable reactions and produces the bleaching and disinfecting effect. On prolonged exposure to air, moisture and carbon dioxide, some of this available chlorine may be lost and the material gradually becomes less effective. Thus option A gives the relevant storage-related reason. It does not completely become sodium chloride, gypsum, or washing soda, so options B, C and D are unsuitable.

Related tags

Bleaching PowderAvailable ChlorineStorageAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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