To stop bleeding, `FeCl_(3)` is applied locally because :

Options

A. `FeCl_(3)` seals the blood vessels
B. `FeCl_(3)` changes the direction of blood flow
C. `FeCl_(3)` reacts with blood to form a solid substance which seals the blood vessel
D. `FeCl_(3)` causes denaturation of proteins present in blood

Explanation

To solve the question, "To stop bleeding, FeCl3 is applied locally because:", we will analyze the properties and actions of FeCl3 in the context of blood coagulation.

### Step-by-Step Solution:

1. **Understanding FeCl3**:
- FeCl3 (Iron(III) chloride) is a chemical compound that dissociates in solution to yield Fe³⁺ ions and Cl⁻ ions.

2. **Dissociation in Water**:
- When FeCl3 is dissolved in water, it dissociates as follows:
\[ \text{FeCl}_3 \rightarrow \text{Fe}^{3+} + 3\text{Cl}^- \]
- The Fe³⁺ ions can interact with water, leading to hydrolysis and the release of H⁺ ions, making the solution acidic.

3. **Acidic Nature**:
- The presence of H⁺ ions indicates that the solution is acidic. This acidic environment can affect the proteins in the blood.

4. **Coagulation Process**:
- Blood contains negatively charged proteins (globular proteins). When Fe³⁺ ions are introduced, they can neutralize the negative charges on these proteins, leading to coagulation.
- The coagulation process involves the transformation of soluble globular proteins into insoluble fibrous proteins.

5. **Denaturation of Proteins**:
- The acidic environment and the presence of Fe³⁺ ions cause denaturation of the globular proteins. Denaturation alters the structure of these proteins, converting them into fibrous proteins that are insoluble.

6. **Formation of a Solid Substance**:
- As the proteins denature and coagulate, they form a solid mass that effectively seals the wound and stops the bleeding.

7. **Conclusion**:
- Therefore, the correct reason for applying FeCl3 to stop bleeding is that it causes the denaturation of proteins present in the blood, leading to coagulation and the formation of a solid substance that seals the blood vessels.

### Final Answer:
FeCl3 is applied locally to stop bleeding because it causes the denaturation of proteins present in the blood, leading to coagulation and the formation of a solid substance that seals the blood vessels.