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When white silver chloride

g(

gCl) is exposed to sunlight, it turns grey. Which product is responsible for this colour change?

Answer and explanation

Correct answer: Silver metal

Silver chloride undergoes photodecomposition in sunlight: \(2\mathrm{AgCl}\xrightarrow{\text{sunlight}}2\mathrm{Ag}+\mathrm{Cl}_2\). The silver metal formed is grey, so it causes the colour change. Chlorine gas is also a product, but it does not cause the grey appearance.

Related tags

ScienceClass 10Chemical ReactionsPhotodecompositionSilver ChlorideChemical Equations

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