Question
PbO and $PbO _2$ react with HCl according to the following chemical equations:
$
\begin{aligned}
& 2 PbO+4 HCl \rightarrow 2 PbCl_2+2 H_2 O \\
& PbO_2+4 HCl \rightarrow PbCl_2+Cl_2+2 H_2 O
\end{aligned}
$
Why do these compounds differ in their reactivity?

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