Nitric acid is an oxidising agent and reacts with $PbO$ but it does not react with $PbO_{2}$. Explain why?

(N/A) $PbO$ is a basic oxide,so it reacts with $HNO_{3}$ to form lead nitrate and water:
$PbO + 2HNO_{3} \longrightarrow Pb(NO_{3})_{2} + H_{2}O$
$PbO_{2}$ does not react with $HNO_{3}$ because $PbO_{2}$ is a strong oxidising agent and $Pb$ is already in its highest oxidation state of $+4$. Since $HNO_{3}$ is also an oxidising agent,no redox reaction occurs between them.