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When limestone, \(\mathrm{CaCO_3}\), is heated, it breaks down into calcium oxide and carbon dioxide. Which type of reaction is this?

Answer and explanation

Correct answer: Thermal decomposition

On heating, calcium carbonate decomposes: \(\mathrm{CaCO_3 \xrightarrow{\Delta} CaO + CO_2}\). The breaking of one compound into two or more simpler substances by heat is called a thermal decomposition reaction. In contrast, in a combination reaction, two or more substances form a single product.

Related tags

Class 10 ScienceChemical ReactionsThermal DecompositionLimestoneCalcium Carbonate

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