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Which of the following reactions is a decomposition reaction but not a thermal decomposition reaction?

Answer and explanation

Correct answer: Decomposition of silver chloride in the presence of light

Silver chloride decomposes in the presence of light to form silver and chlorine: \(2AgCl \xrightarrow{\text{light}} 2Ag + Cl_2\). The breakdown of one compound into simpler substances is a decomposition reaction. Here, light supplies the energy rather than heat, so this is photolytic decomposition. In contrast, heating calcium carbonate causes \(CaCO_3 \rightarrow CaO + CO_2\), making option B an example of thermal decomposition.

Related tags

Class 10 ScienceChemical ReactionsDecomposition ReactionsPhotolytic DecompositionThermal DecompositionSilver Chloride

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