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Question:
On combustion of $\mathrm{Li}, \mathrm{Na}$ and $\mathrm{K}$ in excess of air, the major oxides formed, respectively, are :

$\mathrm{Li}_{2} \mathrm{O}_{2}, \mathrm{Na}_{2} \mathrm{O}_{2}$ and $\mathrm{K}_{2} \mathrm{O}_{2}$ (2)
$\mathrm{Li}_{2} \mathrm{O}, \mathrm{Na}_{2} \mathrm{O}_{2}$ and $\mathrm{KO}_{2}$
$\mathrm{Li}_{2} \mathrm{O}, \mathrm{Na}_{2} \mathrm{O}$ and $\mathrm{K}_{2} \mathrm{O}_{2}$
$\mathrm{Li}_{2} \mathrm{O}, \mathrm{Na}_{2} \mathrm{O}_{2}$ and $\mathrm{K}_{2} \mathrm{O}$

Correct Option: , 2

Solution:

On heating in excess air Li form oxide sodium form peroxide while $\mathrm{K}, \mathrm{Rb}, \mathrm{Cs}$ form superoxide.