The charge on `Fe(OH)_(3)` sol is due to

Options

A. Adsorption of hydroxyl ion
B. Adsorption of hydrogen ion
C. Adsorption of ferric acid
D. Adsorption of feeric ion

Explanation

To determine the charge on `Fe(OH)_(3)` sol, we can follow these steps:

### Step 1: Understand the Formation of `Fe(OH)_(3)` Sol
When ferric chloride (FeCl₃) is added to excess hot water, it hydrolyzes to form ferric hydroxide, `Fe(OH)₃`. This process involves the reaction of ferric ions (Fe³⁺) with hydroxide ions (OH⁻) in water.

### Step 2: Identify the Nature of the Sol
The resulting `Fe(OH)₃` precipitate can form a colloidal sol when dispersed in water. In this colloidal state, the particles of `Fe(OH)₃` can acquire a charge.

### Step 3: Determine the Source of Charge
The charge on the `Fe(OH)₃` sol is primarily due to the adsorption of ferric ions (Fe³⁺) from the solution onto the surface of the `Fe(OH)₃` particles. This adsorption process leads to a net positive charge on the colloidal particles.

### Step 4: Conclusion
Thus, the charge on `Fe(OH)₃` sol is due to the adsorption of ferric ions (Fe³⁺) from the solution.

### Final Answer
The charge on `Fe(OH)_(3)` sol is due to the adsorption of ferric ions (Fe³⁺).

---