The reaction between sodium and water can be made less vigorous by

Match List-$I$ with List-$II$ :

List-$I$	List-$II$
$A$. $K$	$I$. Thermonuclear reactions
$B$. $KCl$	$II$. Fertilizer
$C$. $KOH$	$III$. Sodium potassium pump
$D$. $Li$	$IV$. Absorbent of $CO_2$

Choose the correct answer from the options given below :

Match the following:

Metal	Ore
$1$. Sodium	$a$. Barite
$2$. Potassium	$b$. Carnallite
$3$. Barium	$c$. Beryl
$4$. Beryllium	$d$. Chile saltpetre

Identify the correct statements from the following:
$A$) Among alkali metal ions,$Li^+$ has the highest hydration enthalpy.
$B$) The boiling point of alkali metals increases from $Li$ to $Cs$.
$C$) The density of $K$ is less than that of $Na$ and $Rb$.
$D$) $Li$ has a strong tendency to form superoxide.

$A$ metal $X$ on heating in nitrogen gas gives $Y$. $Y$ on reaction with ${H_2}O$ produces a colourless gas. When this gas is passed through $CuSO_4$ solution,it gives a blue colour. What is $Y$?

The main oxides formed on combustion of $Li, Na$ and $K$ in excess of air are,respectively: