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Why does silver chloride turn from white to grey when kept in sunlight?

Answer and explanation

Correct answer: It decomposes in light to form metallic silver

Silver chloride is a photosensitive compound. In sunlight, it undergoes photodecomposition: \(2\mathrm{AgCl}(s) \xrightarrow{\text{sunlight}} 2\mathrm{Ag}(s) + \mathrm{Cl}_2(g)\). The metallic silver formed is grey, so white silver chloride gradually appears grey. This change is not due to dissolving in water.

Related tags

ScienceClass10Chemical-ReactionsSilver-ChloridePhotodecompositionPhotolysis

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