Conversion of limestone to quick lime is an example of

The conversion of limestone to quick lime is a classic example of a thermal decomposition reaction. Limestone consists primarily of calcium carbonate (CaCO₃). When heated strongly, it breaks down into calcium oxide (CaO), commonly known as quick lime, and carbon dioxide (CO₂) gas.

The chemical equation for this process is:
CaCO₃(s) + heat → CaO(s) + CO₂(g)

A decomposition reaction is defined as a chemical reaction in which a single compound breaks down into two or more simpler substances. In contrast, a combination reaction involves multiple reactants forming one product, a substitution reaction involves an element replacing another in a compound, and a double decomposition (displacement) reaction involves the exchange of ions between two compounds.