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  4. Powder of beryllium burns in air frequently to produce

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Q. Powder of beryllium burns in air frequently to produce

The s-Block Elements

Solution:

Powdered beryllium burns brilliantly in air to give $BeO$ and $Be _{3} N _{2} . Be _{2} O$ is not formed as both $Be$ and $O$ have valency equal to $2$ .
The reactions involved are as follows :
$2 Be + O _{2} \longrightarrow 2 BeO$
$3 Be + N _{2} \longrightarrow Be _{3} N _{2}$