In the Castner’s process for the extraction of sodium,the anode is made of $.......$ metal.

Which one of the following is an $s$-block element?

Alkali metals .........

Which chloride does not exist as hydrate?

Identify the correct statements from the following:
$A$) Among alkali metal ions,$Li^+$ has the highest hydration enthalpy.
$B$) The boiling point of alkali metals increases from $Li$ to $Cs$.
$C$) The density of $K$ is less than that of $Na$ and $Rb$.
$D$) $Li$ has a strong tendency to form superoxide.

When $CO$ is passed over solid $NaOH$ heated to $200\,^{\circ}C$,it forms