Question

The addition of which metal into liquid $N{H}_3$ leads to the formation of a blue solution:

• A. $Li$
• B. $Sr$
• C. $Cs$
• D. $Ba$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A $Li$
B $Sr$
C $Ba$
D $Cs$

Generally alkali and alkali earth metals, when added with liquid ammonia, exhibits blue colour by forming a corresponding amide and hydrogen gas
$2M+2N{H}_3\to 2MN{H}_2+H_2$.
$M$ denotes alkali and alkaline earth metal.
$Li,Sr,Cs$ is alkali metal and $Ba$ alkaline earth metal
Hence options $A,B,C$ and $D$ are correct.