The main oxides formed on the combustion of $L i, N a$ and $K$ in excess of air are, respectively:

L i O_{2}, N a_{2} O_{2}

and

K_{2} O

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L i_{2} O_{2}, N a_{2} O_{2}

and

K O_{2}

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L i_{2} O, N a_{2} O_{2}

and

K O_{2}

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L i_{2} O, N a_{2} O

and

K O_{2}

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Solution

The correct option is C $L i_{2} O, N a_{2} O_{2}$ and $K O_{2}$
$2 L i + \frac{1}{2} O_{2} ⟶ L i_{2} O$
$2 N a + O_{2} ⟶ N a_{2} O_{2}$
$K + O_{2} ⟶ K O_{2}$

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