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(C) When magnesium $(Mg)$ is burnt in air,it forms magnesium oxide $(MgO)$ and magnesium nitride $(Mg_3N_2)$.$2Mg + O_2 \rightarrow 2MgO$$3Mg + N_2 \r

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$Mg$

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(C) When magnesium $(Mg)$ is burnt in air,it forms magnesium oxide $(MgO)$ and magnesium nitride $(Mg_3N_2)$.$2Mg + O_2 \rightarrow 2MgO$$3Mg + N_2 \rightarrow Mg_3N_2$When the resulting ash (containing $Mg_3N_2$) is moistened,it undergoes hydrolysis to produce ammonia $(NH_3)$ gas,which has a characteristic pungent smell.$Mg_3N_2 + 6H_2O \rightarrow 3Mg(OH)_2 + 2NH_3 \uparrow$

$A$. $Be$	$I$. $1.74$
$B$. $Mg$	$II$. $1.84$
$C$. $Ca$	$III$. $2.63$
$D$. $Sr$	$IV$. $1.55$

When a metal is burnt in air,the resulting ash,upon moistening,gives the smell of $NH_3$. Which metal is it?

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