Which of the following chemical regent can provide distinctin between the two ionsisation isomers of the formula `Co(NH_3)_5BrSO_4` ?

Options

A. `BaCl_2` solution
B. dil. HCl
C. dil. `H_2SO_4`
D. Fenton's reagents

Answer

To solve the question of which chemical reagent can distinguish between the two ionization isomers of the formula \( \text{Co(NH}_3\text{)}_5\text{BrSO}_4 \), we will follow these steps:

### Step 1: Identify the Ionization Isomers
The given complex can exist in two ionization isomer forms:
1. **Isomer 1**: \( \text{Co(NH}_3\text{)}_5\text{Br}^2+ \) and \( \text{SO}_4^{2-} \)
2. **Isomer 2**: \( \text{Co(NH}_3\text{)}_5\text{SO}_4^+ \) and \( \text{Br}^- \)

### Step 2: Understand Ionization Isomers
Ionization isomers differ in the anions that are released when the complex ion dissociates in solution. In this case, one isomer releases bromide ions while the other releases sulfate ions.

### Step 3: Determine the Reagent
To distinguish between these two isomers, we need a reagent that reacts differently with the anions present in each isomer.

### Step 4: Analyze the Options
1. **Barium Chloride Solution**:
- If Isomer 1 is present, barium will react with sulfate to form a white precipitate of barium sulfate (\( \text{BaSO}_4 \)).
- If Isomer 2 is present, barium will react with bromide to form barium bromide (\( \text{BaBr}_2 \)), which is soluble in water and will not form a precipitate.

2. **Dilute HCl**: This will not distinguish between the two isomers as both bromide and sulfate are soluble.
3. **Dilute H2SO4**: Similar to HCl, it will not provide a distinction.
4. **Phenton's Reagent**: This reagent is not typically used for distinguishing between these specific ions.

### Step 5: Conclusion
The only reagent that can provide a distinct difference between the two ionization isomers is **Barium Chloride Solution**, as it will produce a precipitate with sulfate but not with bromide.

### Final Answer
The correct option is **Barium Chloride Solution**.

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