Which one of the following doesnot exist ?

N a O_{2}

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K O_{2}

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R b O_{2}

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C s O_{2}

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Solution

The correct option is A $N a O_{2}$
Sodium form peroxide on reaction with air.
$2 N a + O_{2} \to N a_{2} O_{2}$
The superoxide $O_{2}^{-}$ ion is stable only in the presence of larger cations such as K, Rb, Cs.
Hence correct options are b, c and d.

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