$2\text{Pb}{\left({\text{NO}}_3\right)}_2\text{(s)}\stackrel{\Delta }{\to }2\text{PbO}\text{(s)}+4{\text{NO}}_{\text{2}}\text{(g)}+{\text{O}}_2\text{(g)}$  is an example for

If the reactant undergoes decomposition on heating then it is called as chemical decomposition. In the decomposition reaction more than one product is formed from the reactant.