Decomposition reactions require energy either in the form of the heat or light or electricity for breaking down the reactants. Write one equations each for decomposition reactions where energy is supplied in the form of heat, light and electricity .

Explanation

Thermal decomposition
When calcium carbonate is heated, it decomposes to given calcium oxide and carbon dioxide.
`CaCO_(3)(s) overset("Heat")rarr CaO(s) + CO_(2)(g)`
When silver chloride is exposed to light it decomposes to form silver metal and chlorine gas.
`2AgCl (s) overset("Light")rarr 2Ag(s) + Cl_(2)(g)`
When electric current is passed through acidified water, it decomposes to give hydrogen gas and oxygen gas.
`2H_(2)O (l) overset("Electricity")(rarr) 2H_(2)(g) + O_(2)(g)`