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When silver chloride is exposed to light, its colour changes from white to grey. This is an example of which type of decomposition reaction?

Answer and explanation

Correct answer: Photolytic decomposition

In the presence of light, silver chloride decomposes to form metallic silver and chlorine gas: \(2AgCl \xrightarrow{sunlight} 2Ag + Cl_2\). The metallic silver formed causes the grey colour. Since light causes the decomposition, it is photolytic decomposition. In contrast, thermal decomposition is caused by heat, while electrolytic decomposition is caused by electric current.

Related tags

Class 10 ScienceChemical ReactionsDecomposition ReactionsPhotolysisSilver ChlorideChemical Equations

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