Which of the following is/are peroxide(s) ?
Correct option is D. $$ BaO_{2} $$
In $$ {PbO}_{2}, $$ Its $$ Pb^{+4}$$ & $$ 2O^{-2} $$
In $$ {H_{2}O}_{2},$$ there is peroxide linkage
$$ H-O-O-H $$
In $$ SrO_{2}, $$ as Sr is alkaline earth metal
$$ \therefore $$ Its $$ Sr^{2+} $$
$$ \therefore $$ Its $$ O_{2}^{-2}, (\bar{O}-\bar{O}) $$ peroxide linkage
In $$ BaO_{2},$$ Its $$ Ba^{{+2}}\therefore O_{2}^{-2} $$
$$ \bar{O}-\bar{O} $$ peroxide linkage
Hence, the correct options are $$\text{B}$$, $$\text{C}$$ and $$\text{D}$$