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The P-Block Elements

Question
CBSEENCH12006752

Bleaching powder loses its bleaching property when kept in an open bottle for a long time. Give reason.

Solution
CaOCl2 +CO2 ----> CaCO3 +Cl2

Chlorine is responsible for the bleaching property.
when bleaching powder bottle kept for a long time it react with CO2 and produce chlorine.
henceloses the property of bleaching.