Which one of the following does not exist ?

N a_{2} O_{2}

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N a_{2} O

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N a O_{2}

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None of the above

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Solution

The correct option is C $N a O_{2}$
Sodium form peroxide on reaction with excess air.
$2 N a + O_{2} \to N a_{2} O_{2}$
Sodium hydroxide on reaction with metalic sodium form sodium oxide.
$2 N a O H + 2 N a \to N a_{2} O + H_{2}$
The superoxide $(O_{2}^{-})$ ion is stable only in the presence of larger cations such as $K, R b, C s$ .
Hence, correct option is (c).

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