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Oxides of alkali metals
Concepts tested here
- Anomalous behaviour of lithium
All Questions
2012 AIPMT-PRE 1 question
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Which one of the alkali metals forms only the normal oxide, $M_2O$, on heating in air?$4Li + O_2 \rightarrow 2Li_2O$: the small $Li^+$ ion can stabilise only the small oxide ion.
Sodium forms mainly the peroxide ($Na_2O_2$), and K and Rb form superoxides ($MO_2$).
So lithium forms only the normal oxide.