When barium dissolves in liquid ammonia
A) a blue black solution is formed
B) the solution formed is a reducing agent
C) the solution formed shows electrical conductivity
D)[BaNH₃)_x²⁺] ions are formed
The correct answer is

Like alkali metals, the alkaline earth metals like barium dissolve in liquid ammonia to give deep blue-black solutions forming ammoniated ions.

$\mathrm{M}+\left(\mathrm{x}+\mathrm{y}\right){\mathrm{NH}}_3\to {\left[\mathrm{M}{\left({\mathrm{NH}}_3\right)}_{\mathrm{x}}\right]}^{2+}+2{\left[\mathrm{e}{\left({\mathrm{NH}}_3\right)}_{\mathrm{y}}\right]}^{-}$

The solution formed is a reducing agent and shows electrical conductivity.