Select the correct statement with respect to `Fe^(3+)` ions.

Options

A. Iron `(III)` ions react with `H_(2)S` in acidic solution to give a black precipitate of `Fe_(2)S_(3)`
B. Iron `(III)` ions react with ammonium sulphide to give the black precipitate of `Fe_(2)S_(3)`
C. Iron `(III)` ions react with ammonium thioxyanate solution to produce deep red colouration.
D. All of these

Explanation

To determine the correct statement regarding Fe^(3+) ions, we will analyze each option systematically.

### Step-by-Step Solution:

1. **Analyze the first statement**:
- The statement claims that Fe^(3+) ions react with H2S in acidic solution to give a black precipitate of Fe2S3.
- When Fe^(3+) reacts with H2S, it can be reduced to Fe^(2+) and sulfur (S) is produced. However, the precipitate formed is not Fe2S3 but rather FeS, which is typically black, and sulfur is usually a yellow solid. Therefore, this statement is **incorrect**.

2. **Analyze the second statement**:
- This statement suggests that Fe^(3+) reacts with ammonium sulfate (which provides S^(2-)) to give a black precipitate of Fe2S3.
- The reaction actually produces FeS (black precipitate) and elemental sulfur (S), but not Fe2S3. Thus, while a black precipitate is formed, it is not Fe2S3. Therefore, this statement is also **incorrect**.

3. **Analyze the third statement**:
- The statement claims that Fe^(3+) ions react with ammonium thiocyanate (NH4SCN) to produce a deep red coloration.
- When Fe^(3+) reacts with thiocyanate ions (SCN^-), it forms the complex ion [Fe(SCN)]^(2+), which is indeed deep red in color. Therefore, this statement is **correct**.

### Conclusion:
The correct statement with respect to Fe^(3+) ions is that they react with ammonium thiocyanate to produce a deep red coloration.

### Final Answer:
The correct statement is: **Fe^(3+) ions react with ammonium thiocyanate to produce a deep red coloration.**

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