Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

Thermal decomposition is a chemical reaction where a single substance breaks into two or more simple substances when heated. CaCO_3 Heat → CaO + CO_2
Photo decomposition is a chemical reaction in which a substance is broken down into simple substances by exposure to light (photons). 2H_2O_2 sunlight → 2H_2O + O_2
Electrolytic decomposition may result when the electric current is passed through an aqueous solution of a compound. 2H_2O(l) electricity → 2H_2(g) + O_2(g)