Identify the product of the given reaction:

$\mathrm{AgBr}+2{\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3⟶$

 ${\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{diluted}\right)+{\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3⟶$

${\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{concentrated}\right)+{\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3⟶$

Match Column-$\mathrm{I}$ with column-$\mathrm{II}$ and select the correct answer with respect to the name given below.

Code:

Consider the following statements;

${\mathbf{S}}_1:$ Alkali metals are never found in free state in nature.

${\mathbf{S}}_2:$ The melting and boiling points of alkali metals are high. 

${\mathbf{S}}_3:$ The caesium and potassium both are used as electrodes in photoelectric cells.

${\mathbf{S}}_4:$ Alkali metals are normally kept in kerosene oil.

and arrange in the order of true/false.