Why does bleaching solution deteriorate??

Firstly, bleaching solution may be attacked by carbon dioxide(CO2) in air.
Bleaching solution contains the active ingredient ClO-, which can react with carbon dioxide in airand form carbonate, water and chlorine gas.

2ClO- +CO2→CO3 2-+H2O+Cl2




Secondly,bleaching solution is decomposed by sunlight.
The active ingredient ClO- (hypochlorite ion) is light-sensitive. Under light condition, it decomposes to chloride ion and oxygen gas.

2OCl-→Cl-+O2