Which of the following oxide is paramagnetic?

N a_{2} O

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N a_{2} O_{2}

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K_{2} O

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K O_{2}

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Solution

The correct option is D $K O_{2}$
The superoxide ion $(O_{2}^{-})$ contains a three electron bond. Thus it contains unpaired electron and is paramagnetic.

Here $K O_{2}$ is potassium superoxide while all the other are monoxide, dioxide and peroxide.and they contain paired electrons.

Hence, option D is correct.

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