Which of the following process is not responsible for the presence of electric charge on the sol particles?

Options

A. Electron capture by sol particles
B. Adsorption of ionic species from solution
C. Formation of Helmholtz electrical double layer
D. Absorption of ionic species from solution

Explanation

To determine which process is not responsible for the presence of electric charge on sol particles, we need to analyze each of the given options.

### Step-by-Step Solution:

1. **Understanding the Concept of Sol Particles:**
- Sol particles are colloidal particles that can carry an electric charge. This charge can arise from various processes.

2. **Evaluating the Options:**
- **Option A: Electron Capture by Sol Particle**
- When sol particles capture electrons, they gain a negative charge. This process contributes to the overall charge on the sol particles.
- **Conclusion:** This process is responsible for the presence of electric charge.

- **Option B: Adsorption of Ionic Species from the Solution**
- When ionic species from the solution are adsorbed onto the surface of sol particles, they can impart a positive or negative charge depending on the nature of the ions. For example, if positive ions are adsorbed, the sol particle becomes positively charged.
- **Conclusion:** This process is responsible for the presence of electric charge.

- **Option C: Formation of Helmholtz Electric Double Layer**
- The Helmholtz double layer forms at the interface of the sol particles and the surrounding liquid, contributing to the overall charge and stability of the colloidal system.
- **Conclusion:** This process is responsible for the presence of electric charge.

- **Option D: Adsorption of Ionic Species from the Solution (Repeated)**
- This option is repeated and has already been evaluated. It is responsible for the presence of electric charge.

3. **Identifying the Incorrect Process:**
- After evaluating all options, we find that all the mentioned processes contribute to the presence of electric charge on sol particles. However, the question asks for the process that is **not** responsible for the charge.
- Since the options regarding adsorption of ionic species are repeated and emphasized, it suggests that this might be the trick option. However, based on the analysis, all processes listed contribute to the charge.

4. **Final Conclusion:**
- If we consider the context of the question and the repeated emphasis on adsorption, it seems that the question may be misleading. However, based on the understanding of the processes, none of the provided options can be definitively stated as "not responsible" for the charge.

### Final Answer:
None of the processes listed are entirely correct as they all contribute to the electric charge of sol particles. However, if forced to choose based on the emphasis in the transcript, one might consider the "adsorption of ionic species" as the least direct contributor.

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