Which one of the following does not involved coagulation ?

Options

A. Formation of delta regions
B. Peptization
C. Treatment of drinking water by potash alum
D. Clotting of blood by the use of ferric chloride

Explanation

To solve the question "Which one of the following does not involve coagulation?", we will analyze each of the provided options step by step.

### Step 1: Understand Coagulation
Coagulation is a process where colloidal particles aggregate together to form larger particles, leading to precipitation. It often occurs when oppositely charged particles neutralize each other.

### Step 2: Analyze Each Option

**Option 1: Formation of Delta Regions**
- Delta formation occurs when river water (which contains colloidal particles) mixes with seawater (which contains electrolytes).
- The electrolytes neutralize the charges on the colloidal particles, leading to coagulation and precipitation of sediments, which eventually form a delta.
- **Conclusion:** This option involves coagulation.

**Option 2: Peptization**
- Peptization is the process where a freshly prepared precipitate is converted back into a colloidal solution.
- This occurs when the precipitate absorbs ions from the solution, leading to repulsion between particles and dispersion.
- **Conclusion:** Peptization does not involve coagulation.

**Option 3: Treatment of Drinking Water by Potash Alum**
- Potash alum is used to purify drinking water, which contains colloidal impurities.
- When potash alum is added, it acts as an electrolyte that neutralizes the charges on the colloidal particles, leading to coagulation and settling of impurities.
- **Conclusion:** This option involves coagulation.

**Option 4: Clotting of Blood by the Use of Ferric Chloride**
- Blood is a colloidal solution, and when ferric chloride is added, it causes the colloidal particles to coagulate, leading to clot formation.
- The process of clotting is essentially coagulation.
- **Conclusion:** This option involves coagulation.

### Final Answer
After analyzing all the options, the correct answer is **Option 2: Peptization**, as it does not involve coagulation.

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