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

Select the correct statement.

$A$ metal on combustion in excess air forms $X$. $X$ upon hydrolysis with water yields $H_2O_2$ and $O_2$ along with another product. The metal is

Explain the trend of ionisation enthalpy of alkali metals as we move from top to bottom in the group.

Which one of the following alkali metals is the weakest reducing agent as per their $E^{\circ}$ values?

Match column $-I$ with column $-II$ :

Column $-I$	Column $-II$
$(a).$ Spodumene	$(p).$ $K$
$(b).$ Borax	$(q).$ $Na$
$(c).$ Sylvine	$(r).$ $Li$
$(d).$ Chile saltpetre	$(s).$ $Ca$