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

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:

In which of the following is a metal-to-metal bond present?

The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is

Compare the alkali metals and alkaline earth metals with respect to $(i)$ ionization enthalpy,$(ii)$ basicity of oxides,and $(iii)$ solubility of hydroxides.

Which of the following statements are false?