The species that contain peroxide ions is/are:

K O_{2}

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S r O_{2}

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B a O_{2}

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N a_{2} O_{2}

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Solution

The correct options are
B $S r O_{2}$ .
C $B a O_{2}$ .
D $N a_{2} O_{2}$ .
Peroxide is a compound containing an oxygen-oxygen single bond or the peroxide anion, $O_{2}^{2 -}$ . In contrast to oxide ions, the oxygen atoms in the peroxide ion have an oxidation state of $1$ .

(A) $K O_{2}$ have $O_{2}^{-}$ ions, namely, superoxide ion

(B) Oxidation state of oxygen in $S r O_{2}$ is $- 1$ .
(C) Oxidation state of oxygen in $B a O_{2}$ is $- 1$ .
(D) Oxidation state of oxygen in $N a_{2} O_{2}$ is $- 1$ .

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