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What is the main reason that white silver chloride turns grey during its photolytic decomposition?

Answer and explanation

Correct answer: Formation of metallic silver

In sunlight, silver chloride decomposes: \(2\mathrm{AgCl}(s)\xrightarrow{\text{sunlight}}2\mathrm{Ag}(s)+\mathrm{Cl}_2(g)\). The metallic silver formed is grey, so the white silver chloride gradually appears grey. Chlorine gas is also produced, but metallic silver is the main cause of the colour change.

Related tags

ScienceClass10Chemical-ReactionsPhotolysisSilver-ChlorideDecomposition

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