$2\mathrm{Pb}{\left({\mathrm{NO}}_3\right)}_{2\left(\mathrm{s}\right)}\stackrel{∆}{\to }2{\mathrm{PbO}}_{\left(\mathrm{s}\right)}+4{\mathrm{NO}}_{2\left(\mathrm{g}\right)}+{\mathrm{O}}_{2\left(\mathrm{g}\right)}$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.