Which of the following is `(` are `)` function `(s)` of salt bridge ?

Options

A. It completes the electrical circuit with electrons flowing from one electrode to other through wires and flow of ions between the two compartments through salt bridge.
B. It prevents the accumulation of the ions.
C. Both `(a)` and `(b)`
D. None of the above.

Explanation

To answer the question regarding the functions of a salt bridge in an electrochemical cell, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Electrochemical Cell**:
- An electrochemical cell consists of two electrodes: the anode (where oxidation occurs) and the cathode (where reduction occurs). These electrodes are immersed in an electrolyte solution.

2. **Role of the Salt Bridge**:
- The salt bridge is a crucial component that connects the two half-cells of the electrochemical cell. It allows for the flow of ions between the two compartments.

3. **Function 1: Completing the Circuit**:
- The primary function of the salt bridge is to complete the electrical circuit. It allows the flow of ions, which is essential for maintaining the flow of electric current. Electrons flow from the anode to the cathode through an external circuit, while ions flow through the salt bridge.

4. **Function 2: Maintaining Electrical Neutrality**:
- The salt bridge maintains electrical neutrality in the solutions of the two half-cells. As the electrochemical reaction proceeds, one electrode may become positively charged while the other becomes negatively charged. The salt bridge provides ions (such as K⁺ and NO₃⁻ from KNO₃) to counterbalance these charges, preventing charge buildup.

5. **Preventing Liquid-Liquid Junction Potential**:
- By maintaining electrical neutrality, the salt bridge also prevents the formation of a liquid-liquid junction potential. This potential can arise when there is an accumulation of positive or negative charges in the solutions, leading to an unwanted voltage difference.

6. **Conclusion**:
- Therefore, the functions of the salt bridge can be summarized as:
- **Completing the circuit** (allowing current to flow).
- **Maintaining electrical neutrality** (providing ions to balance charges).
- **Preventing liquid-liquid junction potential** (avoiding unwanted voltage differences).

### Final Answer:
Both options A and B are correct functions of the salt bridge.

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