Question

why silver chloride is stored in dark bottles

Answer 1

Silver chloride is stored in dark bottles because when it is come in contact with sunlight it decomposes to form silver and chlorine gas as a result of photo decomposition reaction.

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Answer 2

AgCl quickly darkens on exposure to light by disintegrating into elemental chlorine and metallic silver. This reaction is used in photography and film.Silver chloride is a chemical compound with the chemical formula AgCl. This white crystalline solid is well known for its low solubility in water (this behavior being reminiscent of the chlorides of Tl+ and Pb2+). Upon illumination or heating, silver chloride converts to silver (and chlorine), which is signaled by greyish or purplish coloration to some samples. AgCl occurs naturally as a mineral chlorargyrite.