Give an example for thermal decomposition and photochemical decomposition reactions. Write the relevant balanced chemical equation.

Explanation

Thermal decomposition - On heating potassium chlorate using Manganese dioxide as catalyst, it decomposes into potassium chloride and oxygen.
`underset((s))(2KClO_(3))underset(MnO_(2))overset("light")(to)underset((s))(2KCl)+underset((s))(3O_(2))uarr`
Photochemical decomposition - When white coloured silver chloride is exposed to sunlight, it turns grey and decomposes to form metallic silver and chlorine gas.
`2AgCl(s)overset("sunlight")(to)2Ag(s)+Cl_(2)(g)`