Question

Which of the following statement about solution of alkali metals in liquid ammonia is correct?

• A. The solution have strong oxidizing properties
• B. Both the dilute solution as well as concentrated solution are paramagnetic in nature
• C. Charge transfer is the responsible for the colour of the solution
• D. None of these

Answer 1

The correct option is D None of these

(A) The solution of alkali metals in liq ammonia has strong reducing properties due to presence of free ammoniated electrons.
(B) Dilute solution is paramagnetic due to presence of unpaired electrons in the cavities in ammoniacal solution. In concentrated solutions, ammoniated electrons associate to form electron pairs and the paramagnetic character decreases.
(C) Solvated electrons and solvated metal ions give blue colour to solution. With increase in the concentration, clusters of metal ions are formed and at very high concentration, the solution becomes colored like that of metallic copper.