Question

When a solution of alkaline earth metal in liquid ammonia is evaporated:

• A. they form hexammoniates , $M(N{H}_3{)}_6$
• B. The ammoniates decomposed at high temperatures
• C. The tendency to form ammoniates decreses with increases in the size of the metal
• D. The ammoniates are good conductors of electricity

Answer 1

The correct option is A they form hexammoniates , $M(N{H}_3{)}_6$

When an alkaline earth metals dissolve readily in liquid ammonia,to form solvated metal cations and solvated electrons which give a solution of deep blue colour.

Now, when the G-1 solutions evaporate, we get the metal back, but in the case of G-2 solutions (except Beryllium), they give a metal complex, [M(NH3)6][M(NHX3)X6].