When lead nitrate is heated, it decomposes to give lead oxide, nitrogen dioxide, and oxygen gas. This is an example of which type of reaction?
Correct: D
A decomposition reaction is one where a single compound breaks down into two or more simpler substances. Since this decomposition is brought about by heat (implied by 'heated'), it is specifically a thermal decomposition reaction.
The reaction is: 2Pb(NO₃)₂(s) --(heat)--> 2PbO(s) + 4NO₂(g) + O₂(g).