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Asked by Neha Last Modified
Answer 
When an alkali metal dissolves in liquid ammonia, the solution can acquire different colours. Meaning, dilute solutions of alkali metals in liquid ammonia exhibit dark blue colour this is because of ammoniated electrons absorb energy in the visible region of light.
e.g., M + (x + y)--->[M(
)x]^+ + [e-(
)y]{ammoniated electrons}
However, if the concentration increases above 3M, the colour changes to copper -bronze, and it becomes diamagnetic.
Harshit Bhardwaj
When an alkali metal is dissolved in liquid ammonia, it results in the formation of a deep blue coloured solution.
The ammoniated electrons absorb energy corresponding to red region of visible light. Therefore, the transmitted light is blue in colour.
At a higher concentration (3 M), clusters of metal ions are formed. This causes the solution to attain a copper–bronze colour and a characteristic metallic lustre.
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(a) Na (b) K (c) Rb (d) Cs
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