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

Answer and explanation

Correct answer: Because it can gradually lose available chlorine

Bleaching powder is effective mainly because it contains available chlorine, which is released during suitable reactions and provides bleaching and disinfecting action. Prolonged exposure to air, moisture, and carbon dioxide can reduce this available chlorine through gradual chemical decomposition. Consequently, its bleaching strength falls, so option A is correct. The other choices describe no relevant chemical change and do not explain loss of effectiveness.

Related tags

Bleaching-PowderAvailable-ChlorineStorageChemical-StabilityAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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