Lithium shows diagonal relationship with

The main oxides formed on combustion of $Li, Na$ and $K$ in excess of air are,respectively:

Give uses of $sodium$ $hydrogen$ $carbonate$.

The correct order of hydration enthalpies is
$A. K^{+}$; $B. Rb^{+}$; $C. Mg^{2+}$; $D. Cs^{+}$; $E. Ca^{2+}$
Choose the correct answer from the options given below:

When $NaOH$ is prepared by the chlor-alkali process,the gases released are:

Which of the following can be used to extinguish a fire caused by alkali metals?