Which of the following electrolyte will have maximum flocculation value for `Fe(OH)_(3)` sol ?

Options

A. `NaCl`
B. `Na_(2)S`
C. `(NH_(4))_(3)PO_(4)`
D. `K_(2)SO_(4)`

Explanation

To determine which electrolyte will have the maximum flocculation value for the `Fe(OH)₃` sol, we need to understand the concept of flocculation and how it relates to the charge of the ions involved.

### Step-by-Step Solution:

1. **Identify the Charge of the Colloid**:
- `Fe(OH)₃` is a metal hydroxide and typically carries a positive charge in colloidal form.

2. **Understand Flocculation**:
- Flocculation refers to the process where colloids aggregate to form flocs or clumps. The flocculation value is the minimum concentration of an electrolyte needed to cause flocculation.
- The flocculation value is inversely proportional to the charge of the ions present in the electrolyte. This means that electrolytes that provide ions with a lower charge will lead to a higher flocculation value.

3. **Analyze the Given Electrolytes**:
- **NaCl**: Dissociates into Na⁺ and Cl⁻ (1 positive and 1 negative charge).
- **Na₂S**: Dissociates into 2Na⁺ and S²⁻ (2 positive and 2 negative charges).
- **Na₄P₂O₇**: Dissociates into 4Na⁺ and P₂O₇⁴⁻ (4 positive and 4 negative charges).
- **K₂SO₄**: Dissociates into 2K⁺ and SO₄²⁻ (2 positive and 2 negative charges).

4. **Determine the Negative Charge Contribution**:
- The negative charge from the ions in the electrolytes is crucial for flocculation. The lower the negative charge, the higher the flocculation value.
- Among the options:
- Cl⁻ (from NaCl) has a charge of -1.
- S²⁻ (from Na₂S) has a charge of -2.
- P₂O₇⁴⁻ (from Na₄P₂O₇) has a charge of -4.
- SO₄²⁻ (from K₂SO₄) has a charge of -2.

5. **Conclusion**:
- Since Cl⁻ has the lowest negative charge (-1), it will provide the maximum flocculation value for the positively charged `Fe(OH)₃` sol.
- Therefore, the electrolyte with the maximum flocculation value for `Fe(OH)₃` is **NaCl**.

### Final Answer:
**NaCl** will have the maximum flocculation value for `Fe(OH)₃` sol.