Concentrated aqueous ammonia dissolve(s) which of the following completely ?

Options

A. `AgCl`
B. `AgBr`
C. `Ag_(2)CrO_(4)`
D. `AgI`

Explanation

To determine which compounds are completely soluble in concentrated aqueous ammonia, we will analyze each option given in the question.

### Step-by-Step Solution:

1. **Understanding Aqueous Ammonia**:
- Aqueous ammonia is a solution of ammonia (NH3) in water, which can be represented as NH4OH (ammonium hydroxide). It acts as a ligand and can form complexes with certain metal ions.

2. **Analyzing Silver Chloride (AgCl)**:
- When AgCl is treated with concentrated aqueous ammonia, it forms a soluble complex:
\[ \text{AgCl} + 2 \text{NH}_3 \rightarrow \text{[Ag(NH}_3\text{)}_2]^+ + \text{Cl}^- \]
- This indicates that AgCl is soluble in concentrated aqueous ammonia.

3. **Analyzing Silver Bromide (AgBr)**:
- Similarly, AgBr reacts with concentrated aqueous ammonia to form a soluble complex:
\[ \text{AgBr} + 2 \text{NH}_3 \rightarrow \text{[Ag(NH}_3\text{)}_2]^+ + \text{Br}^- \]
- Therefore, AgBr is also soluble in concentrated aqueous ammonia.

4. **Analyzing Silver Chromate (Ag2CrO4)**:
- When Ag2CrO4 is treated with concentrated aqueous ammonia, it forms a soluble complex:
\[ \text{Ag}_2\text{CrO}_4 + 4 \text{NH}_3 \rightarrow 2 \text{[Ag(NH}_3\text{)}_2]^+ + \text{CrO}_4^{2-} \]
- This shows that Ag2CrO4 is soluble in concentrated aqueous ammonia.

5. **Analyzing Silver Iodide (AgI)**:
- In contrast, AgI does not react with concentrated aqueous ammonia and remains insoluble:
\[ \text{AgI} + \text{NH}_3 \rightarrow \text{No reaction} \]
- Therefore, AgI is insoluble in concentrated aqueous ammonia.

### Conclusion:
- The compounds that dissolve completely in concentrated aqueous ammonia are:
- **AgCl**
- **AgBr**
- **Ag2CrO4**
- The compound that does not dissolve is:
- **AgI**

### Final Answer:
AgCl, AgBr, and Ag2CrO4 are soluble in concentrated aqueous ammonia, while AgI is insoluble.