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Why do we store silver chloride in dark ...

Why do we store silver chloride in dark coloured bottles?

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Silver chloride is a white solid. However, it is very senstive to sun light and decomposes in the presence of light to form silver (grey in colour) and chlorine.
`2AgCl(s) overset("Sun light)")to underset("(Grey)")(2Ag(s)) + Cl_(2)(g)`
In order to avoid action by sun light, it is kept in a coloured bottle.
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