In an electrochemical process, a salt bridge is used

Options

A. as a reducing agent
B. as an oxidizing agent
C. to complete the circuit so that current can flow
D. None of these

Explanation

**Step-by-Step Solution:**

1. **Understanding the Electrochemical Cell:**
- An electrochemical cell consists of two half-cells connected by a salt bridge. Each half-cell contains an electrode and an electrolyte solution.

2. **Role of the Salt Bridge:**
- The primary function of the salt bridge is to maintain electrical neutrality in the half-cells. As the redox reactions occur, ions are produced or consumed, which can lead to a charge imbalance. The salt bridge allows ions to flow between the two half-cells to counteract this imbalance.

3. **Components of the Salt Bridge:**
- A typical salt bridge is made from a gel-like substance (such as agar) mixed with a salt solution (like KCl, NH4Cl, or KNO3). This setup allows ions to move freely while preventing the solutions from mixing completely.

4. **Completing the Circuit:**
- The salt bridge completes the electrical circuit by allowing the flow of ions, which is necessary for the flow of electrons through the external circuit. This flow of electrons is what generates electric current.

5. **Preventing Liquid Junction Potential:**
- The salt bridge also helps prevent liquid junction potential, which can arise when two different electrolyte solutions come into contact. This potential can disrupt the cell's operation.

6. **Conclusion:**
- Therefore, the correct answer to the question about the use of a salt bridge in an electrochemical process is that it is used to complete the circuit and maintain electrical neutrality.

**Final Answer:**
The salt bridge is used to complete the circuit and maintain electrical neutrality in an electrochemical process.

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