$Sodium$ metal is highly reactive and cannot be stored under:

Which one of the following elements reduces $NaOH$ to $Na$?

Lithium shows diagonal relationship with

The incorrect statement regarding the above reactions is:
$Al_{(metal)} \xrightarrow[HCl]{(aq.)} 'X' + \text{Gas } 'P'$
$Al_{(metal)} \xrightarrow[NaOH (aq.)]{+ H_2O} 'Y' + \text{Gas } 'Q'$

The function of "Sodium pump" is a biological process operating in each and every cell of all animals. Which of the following biologically important ions is also a constituent of this pump?

Give two uses of caustic soda.