Question

decomposition reaction require energy either in the form of heat or light or electricity for breaking down the reactants write one equation each for decomposition reaction where energy is supplied in the form of heat,light, and electricity

Answer 1

BY HEAT   FeSO₄→Fe₂O₃+SO₂+SO₃

by eletricity  H₂O→H₂+O₂

hydrogen in the cathaode and oxygen in the anode.

Answer 2

Thermal decomposition reaction (heat)
CaCO3------------>CaO+CO2

Electrolytic decomposition reaction :(electricity)
2H2O--------->2H2+O2

Photochemical decomposition reaction (light):
AgBr---------->Ag+Br