The main oxides formed on combustion of $Li, Na$ and $K$ in excess of air are,respectively:
- A$Li_2O_2, Na_2O_2$ and $KO_2$
- B$Li_2O, Na_2O_2$ and $KO_2$
- C$Li_2O, Na_2O$ and $KO_2$
- D$LiO_2, Na_2O_2$ and $K_2O$
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