Which of the following is not a peroxide?

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(C) $PbO_2$ is not a true peroxide because it does not liberate $H_2O_2$ upon treatment with dilute acids.In a true peroxide,there is an oxygen-oxygen

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$PbO_2$

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(C) $PbO_2$ is not a true peroxide because it does not liberate $H_2O_2$ upon treatment with dilute acids.In a true peroxide,there is an oxygen-oxygen single bond ($-O-O-$ linkage).$Na_2O_2$,$CaO_2$,and $H_2O_2$ contain the peroxide ion $(O_2^{2-})$.In $PbO_2$ (Lead $(IV)$ oxide),the lead atom is bonded to two oxygen atoms via double bonds $(O=Pb=O)$. It is a dioxide,not a peroxide.

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