Question

The alkali metals dissolve in ammonia to give a deep blue solution which is conducting in nature.
$M+\left(x+y\right)N{H}_3\to {\left[M{\left(N{H}_3\right)}_x\right]}^{2+}+2{\left[e{\left(N{H}_3\right)}_y\right]}^{-}$
Which of the following is not true about the solutions of alkali metals in liquid ammonia ?

• A. The blue colour is due to ammoniated electron
• B. The solution is paramagnetic
• C. The blue colour changes to brown on standing
• D. In concentrated solution blue colour changes to bronze and becomes diamagnetic

Answer 1

Answer: (C)

Correct answer is (c) The blue colour changes to brown on standing