Match the elements given in Column-$I$ with the properties mentioned in Column-$II$ :

Column-$I$	Column-$II$
$A$. $Li$	$1$. Insoluble sulphate
$B$. $Na$	$2$. Strongest monoacidic base
$C$. $Ca$	$3$. Most negative $E^{\circ}$ cell value among alkali metals
$D$. $Ba$	$4$. Insoluble oxalate
	$5$. $6s^2$ outer electronic configuration

(A-3, B-2, C-4, D-5) $A-3, B-2, C-4, D-5$
$(A)$ $Li$: Due to very high hydration enthalpy,$E^{\circ}$ is most negative.
$(B)$ $Na$: $Na$ gives $NaOH$ (strong base). One mole of it replaces $1 \ mol \ H^{+}$ from acid,therefore it is the strongest monoacidic base.
$(C)$ $Ca$: Hydration energy is low,therefore calcium oxalate is insoluble.
$(D)$ $Ba$: Hydration energy is low as the size of $Ba^{2+}$ is large,therefore barium sulphate is insoluble. $6s^2$ is the valence shell electronic configuration.