Question

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

Answer 1

In the presence of heat (Thermal decomposition reaction):
${\text{CaCO}}_3\text{(s)}\to \text{CaO(s)}+{\text{CO}}_2\text{(g)}$
[1 Mark]

In the presence of sunlight (Photolytic decomposition reaction):
$2\text{AgCl(s)}\to 2\text{Ag(s)}+{\text{Cl}}_2\text{(g)}$
[1 Mark]
In the presence of electricity (Electrolytic decomposition reaction):
$2{\text{H}}_2\text{O(l)}\to 2{\text{H}}_2\text{(g)}+{\text{O}}_2\text{(g)}$
[1 Mark]