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The main oxides formed on combustion of Li, Na, and K in excess of air respectively are

$LiO_{2}$ ,

$Na_{2}O_{2}$ and

$K_{2}O$

$Li_{2}O_{2}$ ,

$Na_{2}O_{2}$ and

$KO_{2}$

$Li_{2}O$ ,

$Na_{2}O_{2}$ and

$KO_{2}$

$Li_{2}O$ ,

$Na_{2}O$ and

$KO_{2}$

Option C

$2Li +\frac{1}{2}O_{2}(g)\rightarrow Li_{2}O$

$2Na+ O_{2}(g)\rightarrow Na_{2}O_{2}$

$K+O_{2}(g)\rightarrow KO_{2}$

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