Question

write 3 equation for decomposition reaction where energy is supplied in form of heat light and electricity???
Urgent answer needed :-)

Answer 1

on heating CaCO3 decompose into CaO and CO2
on electrolysing water,H2O splits into hydrogen and oxygen
photodecomposition of AgCl produce silver and liberate chlorine gas

Answer 2

HI there !!

1)
When electricity is passed through water , it leads to the formation of H₂ and O₂.

electricity
2H₂O -----------------------> 2H₂ + O₂


2)
When Calcium carbonate is heated it form Calcium oxide [ quick lime ] and water

heat
CaCO₃ ----------------> CaO + CO₂


3)
When silver chloride is kept in sunlight for some time ,
it decomposes and forms silver and chlorine gas.

sunlight
2AgCl [s] -------------------> 2Ag [s] + Cl₂ [g]