When a metal of group 1 was dissolved in liquid ammonia, the following observations were obtained
(a) Blue solution was obtained initially.
On concentrating the solution, blue colour changed to bronze colour.How do you account for the blue colour of the solution? Given the name of the product formed on keeping the solution for some time.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Reaction**: When a Group 1 metal (let's denote it as M) is dissolved in liquid ammonia (NH3), a complex ion is formed. The reaction can be represented as:
\[ M + n \text{NH}_3 \rightarrow [M(\text{NH}_3)_n]^+ + \text{ammoniated electrons} \]
Here, the metal ion forms a complex with ammonia molecules, and ammoniated electrons are also produced.

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