Decomposition Reaction Explained
The question describes the breakdown of calcium carbonate (CaCO₃$) into calcium oxide (CaO$) and carbon dioxide (CO₂$) when subjected to heat.
This process is a decomposition reaction because a single compound breaks down into two or more simpler substances.
The specific type of decomposition is determined by the energy source required for the reaction.
- Heating is the energy source mentioned in the question.
- Decomposition reactions driven by heat are called thermal decomposition reactions.
The chemical equation for this reaction is:
\text{CaCO}_3(s) \xrightarrow{\Delta} \text{CaO}(s) + \text{CO}_2(g)$
Other options are incorrect because:
- Photo decomposition uses light.
- Exothermic reactions release heat (this reaction requires heat, making it endothermic).
- Electrolytic decomposition uses electricity.
Therefore, the decomposition of calcium carbonate on heating is a thermal decomposition reaction.
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