The blue colour of solution of ammonia and alkali metals is due to which species?

Explanation

To solve the question regarding the blue color of the solution of ammonia and alkali metals, we can break down the explanation into clear steps.

### Step-by-Step Solution:

1. **Understanding the Context**:
- Alkali metals, when dissolved in ammonia, produce a deep blue solution. This is the phenomenon we need to explain.

2. **Dissolution of Alkali Metals**:
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