Question

decomposition reaction requires energy either in the form of heat and light or electricity for breaking down the reactants. write one equation for decompostion reaction where energy is supplied in the form of heat .light and electricity

Answer 1

2FeSO4 -----> Fe2O3 +SO2+SO3
IT IS FOR HEAT

2H2O -----> 2H2 + O2
IT IS FOR ELECTRICITY

2AgCl ------> 2Ag +Cl2
IT IS FOR LIGHT


HOPE IT IS USEFUL

Answer 2

Answer: Decomposition reaction : It is a type of reaction in which a larger molecule decomposes into two or more smaller molecule. It always require energy for breaking of bonds and hence is always endothermic.

i) Decomposition due to heat: Thermal decomposition

$CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

ii) Decomposition due to light: Photolytic decomposition

$2AgBr(s)\rightarrow 2Ag(s)+Br_2(g)$

iii) Decomposition due to electricity: electrolytic decomposition

$2H_2O(l)\rightarrow 2H_2(g)+O_2(g)$