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  4. Which one of the alkali metals, forms only, the normal oxide, M2O on heating in air ?

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Q. Which one of the alkali metals, forms only, the normal oxide, $M_2O$ on heating in air ?

Solution:

Lithium (Li) is the alkali metal which forms only normal oxide, $Li_2O$ when heated in air.
$2Li + 1/2O_2 \rightarrow Li_2O$