Question

When $Na$ and $Li$ are placed in dry air, we get:

• A. $NaOH,N{a}_{2}O,L{i}_{2}O$
• B. $N{a}_{2}O,L{i}_{2}O$
• C. $N{a}_{2}O,L{i}_{2}O,L{i}_{3}N,N{H}_3$
• D. $N{a}_{2}O,L{i}_{3}N,L{i}_{2}O$

Answer 1

The correct option is D $N{a}_{2}O,L{i}_{3}N,L{i}_{2}O$

Among the alkali metals, only lithium forms nitride.
$Li$ reacts with $N_2$ and $O_2$ of air forming $L{i}_{3}N$ and $L{i}_{2}O$ but Na reacts with only $O_2$ forming $N{a}_{2}O$. $Na$ does not react with $N_2$ forming $N{a}_{3}N$ (It requires high temperature). Since it is dry air, no hydroxides will be formed.