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(D) Alkali metals (except $Li$) react with oxygen to form oxides,whereas alkaline earth metals,when burnt in air,react with both $O_2$ and $N_2$ to fo

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$K, Mg$

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(D) Alkali metals (except $Li$) react with oxygen to form oxides,whereas alkaline earth metals,when burnt in air,react with both $O_2$ and $N_2$ to form oxides and nitrides respectively.$K$ is an alkali metal that forms $KO_2$ (superoxide) in air.$Mg$ is an alkaline earth metal that forms both $MgO$ and $Mg_3N_2$ when burnt in air.Therefore,$A = K$ and $B = Mg$.

Constituents	Percentage
$1$. $CaO$	$a$. $2-3\%$
$2$. $MgO$	$b$. $50-60\%$
$3$. $SiO_2$	$c$. $5-10\%$
$4$. $Al_2O_3$	$d$. $20-25\%$

To distinguish between $A$ and $B$,it is observed that both elements form oxides,but $B$ also forms a nitride when burnt in air. What are $A$ and $B$?

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