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Why does silver chloride turn grey in sunlight?

Answer and explanation

Correct answer: Due to the formation of silver metal

Silver chloride undergoes photodecomposition in sunlight: \(2\mathrm{AgCl}(s)\xrightarrow{\text{sunlight}}2\mathrm{Ag}(s)+\mathrm{Cl}_2(g)\). The silver metal produced is grey, so silver chloride gradually appears grey. Although chlorine gas is also formed, it is not responsible for the grey colour.

Related tags

ScienceClass10Chemical ReactionsPhotodecompositionSilver ChloridePhotolysis

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