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

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$\begin{aligned} {LiO}_{2}, {Na}_{2} O_{2} \end{aligned}$ 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 ${KO}_{2}$

answer is A.

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Detailed Solution

The primary oxides produced when Li, Na, and K are burned in excess of air are, respectively, ${Li}_{2} O, {Na}_{2} O_{2}$ and ${KO}_{2}$ .
Lithium produces the monoxide under normal circumstances, sodium produces the peroxide, and other alkali metals produce the superoxide.

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