The highly reactive alkali metals are kept in

What are the common physical and chemical features of alkali metals?

Sodium oxide dissolves in water to give sodium hydroxide,which indicates its:

Match the following:

Elements	Ore
$1$. Lithium	$a$. Beryl
$2$. Sodium	$b$. Spodumene
$3$. Beryllium	$c$. Gypsum
$4$. Calcium	$d$. Carnallite

Observe the following statements:
Statement-$I$: Both $LiF$ and $CsI$ have low solubility in water.
Statement-$II$: Low solubility of $LiF$ in water is due to its high lattice enthalpy,and that of $CsI$ is due to its smaller hydration enthalpy of ions.

The product obtained as a result of a reaction of nitrogen with $CaC_2$ is