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Which of the following is a decomposition reaction but not a photolytic decomposition reaction?

Answer and explanation

Correct answer: Heating calcium carbonate

When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). This is thermal decomposition because heat causes the breakdown, not light. Silver chloride and silver bromide undergo photolytic decomposition in sunlight. In contrast, iron reacting with copper sulfate is a displacement reaction.

Related tags

Class 10 ScienceChemical ReactionsDecomposition ReactionsThermal DecompositionPhotolysisChemical Equations

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