$NaOH$ (solid) $+ CO \xrightarrow{200^\circ C} X$; product $X$ is

Match List-$I$ with List-$II$.

List-$I$	List-$II$
$(a)$ $Li$	$(i)$ Absorbent for carbon dioxide
$(b)$ $Na$	$(ii)$ Electrochemical cells
$(c)$ $KOH$	$(iii)$ Coolant in fast breeder reactors
$(d)$ $Cs$	$(iv)$ Photoelectric cell

Choose the correct answer from the options given below:

The strongest reducing agent among the alkali metals is

Write balanced equations for reactions between
$(a)$ $Na_{2}O_{2}$ and water
$(b)$ $KO_{2}$ and water
$(c)$ $Na_{2}O$ and $CO_{2}$

Beryllium is placed above magnesium in the second group. Beryllium dust,therefore,when added to $MgCl_2$ solution will:

Alkali metals .........