Question

why reagents like Silver Bromide stored in dark bottles?

Answer 1

Silver bromide reacts to light (the halide salts of silver are used in photographic emulsions) the colored bottles stop the light getting to the chemical and spoiling it. as it is photolytic ,if it is stored in other bottles it gets decomposed and forms silver and bromine.so it is stored in dark bottles.

Answer 2

hey mate here is ur ans

reagents like silver bromide decompose into silver metal and bromine gas in the presence of sunlight (especially diffused) so they are kept in dark bottles or colored bottles so as to prevent them from getting decomposed and obtain in original form for use
sunlight
2AgBr--------------->2Ag+Br2

this is a photochemical decomposition reaction