The solubility order for alkali metal fluoride in water is

The commercial method of preparation of potassium by reduction of molten $KCl$ with metallic sodium at $850 ^\circ C$ is based on the fact that:

In which of the following is sodium metal stored?

$Li$ does not resemble other alkali metals in which of the following properties?

Glauber's salt is

Identify $A$ to $E$ in the following reactions:
$\underset{\text{Alkali metals}}{\mathop{A}}\,+N_2$ $\xrightarrow{\Delta }B$ $\xrightarrow{H_2O}C+D$
$C+HCl\rightarrow E$
(Where $D$ is $NH_3$ and $E$ is a salt,and $C$ is a base)