The correct order of increasing ionic character among $LiH$,$NaH$,$KH$,$RbH$,$CsH$ is

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.

Identify the element having general electronic configuration $ns^1$ from the following.

Which of the following statements is correct for a highly pure dilute solution of sodium in liquid ammonia?

Alkali metals have negative reduction potential and hence they behave as

Which of the following statements are correct for alkali metal compounds?
$(i)$ Superoxides are paramagnetic in nature.
(ii) The basic strengths of hydroxides increase down the group.
(iii) The conductivity of chlorides in their aqueous solutions decreases down the group.
(iv) The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.