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

$\begin{array}{1 1} (1)Li_2O, Na_2O\;and\;KO_2 \\ (2) LiO_2, Na_2O_2\; and\; K_2O \\ (3) Li_2O_2, Na_2O_2\; and\;KO_2 \\(4) Li_2O, Na_2O_2\; and\; KO_2 \end{array} $

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