Select the correct statement about salt bridge

Options

A. Salt bridge helps to complete the electrical circuit
B. It helps to maintain the electrical neutrality of the solution in the two half cell
C. It maintains flow of electric current
D. All of these

Answer

To solve the question regarding the correct statement about the salt bridge, we can analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Understanding the Function of a Salt Bridge:**
- A salt bridge is a U-shaped tube filled with a concentrated solution of an inert electrolyte. Its primary role in an electrochemical cell (like a galvanic cell) is to connect the two half-cells.

2. **Analyzing Each Statement:**
- **Option 1:** "A salt bridge helps to complete the electrical circuit."
- This statement is correct. The salt bridge allows the flow of ions between the two half-cells, which completes the circuit necessary for the flow of electrons from the anode to the cathode.

- **Option 2:** "It helps to maintain the electrical neutrality of the solution in two half cells."
- This statement is also correct. As the redox reactions occur in the half-cells, ions are consumed or produced. The salt bridge allows ions to flow in to balance the charge, thus maintaining electrical neutrality.

- **Option 3:** "It maintains the flow of electric current."
- This statement is correct as well. By allowing ions to move between the half-cells, the salt bridge facilitates the continuous flow of electric current in the circuit.

3. **Conclusion:**
- Since all three statements (Option 1, Option 2, and Option 3) are correct, we can conclude that the correct answer is:
- **Option 4:** "All of these."

### Final Answer:
The correct statement about the salt bridge is **Option 4: All of these.**