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 a red region of visible light. Therefore, the transmitted light is blue in colour.
What is alkali metal?
All elements of Group 1 are highly reactive. It should be stored under oil so that air and water cannot enter. When reacting with water, Group 1 elements form metal hydroxides. It is alkaline (pH above 7). Therefore, it is called an alkali metal.
Therefore, 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 a red region of visible light. Therefore, the transmitted light is blue in colour.
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