Match the following:

List-$I$	List-$II$
$A$. Alkali metals	$I$. $ns^2 np^6$
$B$. Alkaline earth metals	$II$. $ns^1$
$C$. Halogens	$III$. $ns^2 np^5$
$D$. Noble gases	$IV$. $ns^2$

Identify the elements of alkali metals and alkaline earth metals respectively having the highest $1^{st}$ ionization enthalpy.

Match the following compounds with their respective uses:

Compound	Uses
$1. CaCO_3$	$a.$ In purification of coal gas
$2. Ca(OH)_2$	$b.$ As an antacid
$3. CaO$	$c.$ In paper and textile industries
$4. Na_2CO_3 \cdot 10H_2O$	$d.$ In glass and leather industries

There are four identical containers,initially evacuated,and equal moles of the mentioned compounds are taken in each container (as shown in the diagram). The temperature is kept at $500 \ ^oC$ in each container,which are connected to a manometer. If the heights of the $Hg$ column recorded in the manometers are $x_1, x_2, x_3,$ and $x_4$ respectively,then the relation between $x_1, x_2, x_3,$ and $x_4$ is:

Match Column-$I$ with Column-$II$ :

Column-$I$	Column-$II$
$(a)$ $NaOH$	$(p)$ Silvine
$(b)$ $Na_2CO_3$	$(q)$ As cooling agent in nuclear reactor
$(c)$ Liquid $Na$	$(r)$ Detergent soap
$(d)$ Potassium	$(s)$ In purification of Bauxite

Which of the following statements is not correct?