Question

$2{\text{Pb(NO}}_3{)}_2\text{(s)}\stackrel{\text{Heat}}{\to }2\text{PbO(s)}+4{\text{NO}}_2\text{(g)}+{\text{O}}_2\text{(g)}$

The given reaction is an example of :

• A. Combination reaction
• B. Decomposition reaction
• C. Endothermic reaction
• D. Exothermic reaction

Answer 1

Answer: (B), (C)

Endothermic reaction

In the given reaction, a single compound ${\text{Pb(NO}}_3{)}_2$ is breaking down on heating to form different compounds $\text{PbO},{\text{NO}}_2,{\text{O}}_2$. Therefore, this reaction is a decomposition reaction.
Also, the given reaction is an endothermic reaction as heat is absorbed for the reaction to occur.
This is a type of thermal decomposition reaction.