Question

Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:

• A. sodium ion-ammonia complex
• B. sodamide
• C. sodium-ammonia complex
• D. ammoniated electrons

Answer 1

The Correct Option is D

The question is about the deep blue color that arises when sodium metal dissolves in liquid ammonia. Understanding the process and chemistry involved will help determine the correct answer. 

When sodium metal is dissolved in liquid ammonia, it forms a deep blue solution. This color is attributed to the presence of solvated, or "ammoniated," electrons. Here's how the process works:

1. Dissolution of Sodium: Sodium (Na) when added to liquid ammonia (NH₃), first undergoes ionization:
   • The sodium atoms lose electrons to form sodium ions (Na⁺).
2. Formation of Ammoniated Electrons: The electrons released do not immediately pair up with other ions or atoms. Instead, they become solvated by ammonia molecules forming "ammoniated electrons."
   • The ammonia molecules surround each free electron, stabilizing it.
3. Resulting Deep Blue Color: The deep blue solution is due to these free, solvated electrons. The electrons give rise to the characteristic color by absorbing light and causing the release of specific wavelengths.

Thus, the blue color and the phenomenon can be attributed to the process where ammonia stabilizes the free electrons, resulting in ammoniated electrons.

Conclusion:

Among the given options, the correct one is ammoniated electrons, as they are responsible for the deep blue color of the solution when sodium is dissolved in liquid ammonia.