What are the by-products in the Solvay process for the production of $Na_2CO_3$?

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.

What is the correct order of increasing basic strength for $MgO, SrO, K_2O$,and $NiO$?

When a moderate amount of sodium metal is dissolved in liquid ammonia at low temperature,which of the following is $NOT$ obtained?

Which of the following metals forms a saline hydride?

The aqueous solutions of lithium salts are poor conductors of electricity compared to other alkali metals because of: