Which of the following statements about $N a_{2} O_{2}$ is not correct?

N a_{2} O_{2}

oxidises

C r^{3 +}

C r O_{4}^{2 -}

in acid medium

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It is a derivative of

H_{2} O_{2}

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It is the super oxide of sodium

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It is diamagnetic in nature

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Solution

The correct option is D It is the super oxide of sodium
$N a_{2} O_{2}$ is peroxide of sodium. It contains peroxide ion $O_{2}^{2 -}$ which can be represented as $^{-} O - O^{-}$ .

Hence, it is considered as derivative of hydrogen peroxide $H_{2} O_{2}$ .

Monoxide ion is $O^{2 -}$ .

Superoxide ion is $O_{2}^{-}$

Usually sodium forms the peroxide $N a_{2} O_{2}$ .

It does not contain any unpaired electrons, thus it is diamagnetic in nature.

Hence, option $C$ is not correct about $N a_{2} O_{2}$ .

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