A salt bridge

Options

A. allows the flow of current by completing the electrical circuit
B. allows easy intermixing of the lons in the two half cells.
C. eliminates liquid junction potential
D. maintains the electrical neutrality of the two half cells.

Answer

### Step-by-Step Solution:

1. **Understanding the Concept of a Salt Bridge:**
A salt bridge is a device used in electrochemical cells to connect the oxidation and reduction half-cells. It typically contains a salt solution that allows ions to flow between the two half-cells.

2. **Function of a Salt Bridge:**
The primary functions of a salt bridge include:
- Completing the electrical circuit by connecting the two half-cells.
- Maintaining electrical neutrality in both half-cells by allowing the movement of ions.
- Preventing the mixing of different solutions in the half-cells to avoid unwanted reactions.

3. **Analyzing the Given Options:**
The question provides four statements about the functions of a salt bridge:
- **Option A:** Allows the flow of current by completing the electrical circuit.
- **Option B:** Allows easy intermixing of ions in the two half-cells.
- **Option C:** Eliminates liquid junction potential.
- **Option D:** Maintains the electrical neutrality of the two half-cells.

4. **Evaluating Each Option:**
- **Option A:** True. The salt bridge connects the two half-cells, allowing current to flow and completing the circuit.
- **Option B:** False. The salt bridge does not allow for easy intermixing of ions; it prevents direct mixing of the solutions in the half-cells.
- **Option C:** True. By maintaining electrical neutrality, the salt bridge helps eliminate any potential difference that could create a liquid junction potential.
- **Option D:** True. The salt bridge maintains the electrical neutrality of both half-cells by allowing ions to move and balance charges.

5. **Conclusion:**
Based on the evaluation, the correct statements regarding the functions of a salt bridge are:
- A (Allows the flow of current by completing the electrical circuit)
- C (Eliminates liquid junction potential)
- D (Maintains the electrical neutrality of the two half-cells)

### Final Answer:
The correct options are A, C, and D.

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