The oxide of $Cs$ is:

When sodium is dissolved in liquid $NH_3$,the solution becomes blue due to the presence of:

Explain the properties of sodium carbonate.

When sodium $(Na)$ metal is dissolved in liquid ammonia $(NH_3)$, it imparts a blue colour to the solution. This blue coloration is due to:

$A$ metal $M$ reacts with $N_2$ to form a compound $A$ $(M_3N)$. Heating $A$ at high temperature gives back $M$,and passing $A$ through $H_2O$ produces gas $B$. Gas $B$ turns $CuSO_4$ solution into a deep blue color. What are $A$ and $B$?

What is sodium amalgam and how is it obtained?