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

Explanation

(1) Thermal decomposition :
`underset("Ferrous sulphate")(2FeSO_(4)(s)) overset(Delta)to underset("Ferric oxide")(Fe_(2)O_(3)(s)) + underset("Sulphur dioxide")(SO_(2)(g)) + underset("Sulphur trioxide")(SO_(3)(g))`
(2) Decomposition by light :
`underset("Silver chloride")(2AgCl(s)) overset("Light")to underset("Silver")(2Ag(s)) + underset("Chlorine")(Cl_(2)(g))`
(3) Decomposition by electricity :
`underset("Aluminium oxide")(2Al_(2)O_(3)(aq)) overset("Electricity")to underset("Aluminium")(4Al(s)) + underset("Oxygen")(3O_(2)(g))`