The electronic configuration of $Cs$ is

Given below are two statements:
Statement $I$: Lithium and Magnesium do not form superoxide.
Statement $II$: The ionic radius of $Li^{+}$ is larger than the ionic radius of $Mg^{2+}$.
In the light of the above statements,choose the most appropriate answer from the options given below:

Alkali metals are strong reducing agents because

Excess of $Na^{+}$ ions in our system causes:

The most soluble bicarbonate is

Compared to alkaline earth metals,what do alkali metals exhibit?