Question

Which type of reaction is the heating of calcium carbonate?

• A. Displacement reaction
• B. Combination reaction
• C. Decomposition reaction
• D. Double displacement reaction

Answer 1

The correct option is C

Decomposition reaction

When we heat calcium carbonate (CaCO${}_3$), it breaks down or decomposes into calcium oxide (CaO) and carbon dioxide (CO${}_2$). The reaction can be represented as follows:
${\mathrm{CaCO}}_3\stackrel{\Delta }{\to }\mathrm{CaO}+{\mathrm{CO}}_2$
Since here a single reactant breaks down or decomposes into two or more simpler products, it is called a decomposition reaction.​​​​​​​