The coagulating power of an effective ion carrying the charge opposite to the sol particles has been illustrated by :-

Answer

To solve the question regarding the coagulating power of an effective ion carrying the charge opposite to the sol particles, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Coagulation**: Coagulation refers to the process where colloidal particles aggregate to form a precipitate. This process is influenced by the presence of ions in the solution.

2. **Identifying the Role of Ions**: The ions that can cause coagulation must carry a charge opposite to that of the colloidal particles. For example, if the colloidal particles are negatively charged, then positively charged ions will be effective in coagulating them.

3. **Hardy-Schulze Rule**: The coagulating power of an electrolyte is quantitatively described by the Hardy-Schulze rule. This rule states that the effectiveness of an ion in coagulating a colloidal solution is directly related to its valency.

4. **Valency and Coagulation Power**: According to the Hardy-Schulze rule, ions with higher valency are more effective in coagulating colloidal particles. For instance, a divalent ion (charge of +2) will have a greater coagulating power than a monovalent ion (charge of +1).

5. **Conclusion**: Therefore, the coagulating power of an effective ion carrying the charge opposite to the sol particles is illustrated by the Hardy-Schulze rule, which emphasizes the importance of the valency of the coagulating ion.

### Final Answer:
The coagulating power of an effective ion carrying the charge opposite to the sol particles has been illustrated by the Hardy-Schulze rule.