Which of the following combinations will produce $H_2$ gas?

In the given reaction,the oxide of sodium is .... $4Na + O_2 \to 2Na_2O$ and $Na_2O + H_2O \to 2NaOH$

Which is most basic in character?

$A$ metal $M$ reacts with $N_2$ to form a compound $A$ $(M_3N)$. Heating $A$ at a high temperature gives back $M$,and passing $A$ through $H_2O$ results in the evolution of gas $B$. Gas $B$ turns $CuSO_4$ solution blue. What are $A$ and $B$ respectively?

Write a note on halides of alkali metal elements and their physical properties.

What is the formula of lithium imide?