Question

why do we store silver chloride in dark coloured bottles

Answer 1

silver chloride on exposure to sunlight decomposes as follows :-
2AgCl ------ 2Ag + Cl2
Therefore silver chloride stored in dark coloured bottles.

Answer 2

silver chloride is stored in dark coloured botels because when it exposed to sunlight it undergoes decomposition reaction to form silver and clorine

REACTION INVOLVED:-
2Agcl--------> 2Ag + cl2