Question

The reaction given below is an example of a/an:
$2{\text{Pb(NO}}_3{)}_2\text{(s)}\stackrel{\text{Heat}}{\to }2\text{PbO(s)}+4{\text{NO}}_2\text{(g)}+{\text{O}}_2\text{(g)}$$O_2$

• A. combination reaction
• B. decomposition reaction
• C. Double displacement reaction
• D. exothermic reaction

Answer 1

The correct option is B decomposition reaction

In the given reaction a single reactant lead nitrate, $\left[{\text{Pb(NO}}_3{)}_2\right]$ on heating is breaking down into different products like lead oxide ($\text{PbO}$), nitrogen dioxide (${\text{NO}}_2$) and oxygen (${\text{O}}_2$). This is an example of a decomposition reaction. The reaction is endothermic in nature since it involves absorption of heat. In other words the given reaction is a thermal decomposition reaction.