# Which of the following is not a true peroxide

$\begin{array}{1 1}(a)\;PbO_2\\(b)\;NaHO_2\\(c)\;BaO_2\\(d)\;Na_2O_2\end{array}$

$PbO_2$.
$PbO_2$ are not true peroxide because they do not liberate $H_2O_2$ on treatment with dilute acids
Hence (a) is the correct answer.
answered Jan 24, 2014
edited Nov 16, 2017