With which metal ion, aqueous ammonia reacts to give a deep blue solution?

Options

A. `Ag^oplus`
B. `Mg^(2+)`
C. `Li^oplus`
D. `Cu^(2+)`

Answer

To solve the question "With which metal ion does aqueous ammonia react to give a deep blue solution?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Metal Ion**: We need to determine which metal ion reacts with aqueous ammonia to produce a deep blue solution. The most common metal ion known for this reaction is copper (Cu²⁺).

2. **Understand the Reaction**: When aqueous ammonia (NH₃) is added to a solution containing copper ions, a complex ion is formed. This complex is known as tetraamminecopper(II) ion, which has the formula [Cu(NH₃)₄]²⁺.

3. **Color of the Complex**: The tetraamminecopper(II) complex is characterized by its distinct deep blue color. This is a key indicator that copper ions are involved in the reaction with ammonia.

4. **Conclusion**: Based on the above points, we conclude that the metal ion that reacts with aqueous ammonia to give a deep blue solution is copper (Cu²⁺).

### Final Answer:
The metal ion that reacts with aqueous ammonia to give a deep blue solution is **copper (Cu²⁺)**.

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