The hydration energy of $Mg^{2+}$ is

Which metal does not give the following reaction: $M + \text{water or steam} \to \text{oxide} + H_2 \uparrow$?

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)

Describe two important uses of each of the following: $(i)$ caustic soda,$(ii)$ sodium carbonate,$(iii)$ quicklime.

Which of the following has the lowest thermal stability?

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: