It is a type of chemical reaction that produces two or more products from one source.
Thermal decomposition reaction, electrolysis, and photolysis are the three types of decomposition reactions.
When a single component is heated, it decomposes into two or more simple compounds in a thermal breakdown reaction.
This reaction is frequently endothermic since heat is required to break the bonds present in the compound.
When an electric current is passed through a chemical's aqueous solution, an electrolytic breakdown reaction can occur. Example: electrolysis of water.
Photolysis is the decomposition or separation of molecules from a compound caused by the action of light.
The given reaction is an example of a decomposition reaction as Calcium carbonate decomposes into two new products i.e. Calcium oxide and Carbon dioxide.
The calcium oxide that is generated is used to produce heat and light. It's a component of cement.
Therefore, the reaction is a decomposition reaction.