Select the correct statement

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, "Select the correct statement," regarding the function of a salt bridge in electrochemistry, we can analyze the provided information step by step.

### Step-by-Step Solution:

1. **Understanding the Role of a Salt Bridge**:
- A salt bridge is a crucial component in an electrochemical cell, connecting the two half-cells (anode and cathode).
- It allows for the flow of ions between the two compartments, which is essential for maintaining electrical neutrality.

2. **Completing the Electrical Circuit**:
- The salt bridge helps to complete the electrical circuit by allowing ions to flow, which balances the charge as electrons move through the external circuit.
- Without a salt bridge, the flow of electrons would stop due to charge buildup.

3. **Maintaining Electrical Neutrality**:
- As oxidation occurs at the anode (where electrons are produced), positive ions are generated. Conversely, at the cathode (where reduction occurs), positive ions are consumed.
- The salt bridge compensates for these changes by allowing anions to flow into the anode compartment and cations to flow into the cathode compartment, thus maintaining electrical neutrality.

4. **Flow of Electric Current**:
- The flow of electric current in the external circuit is due to the movement of electrons from the anode to the cathode.
- The salt bridge facilitates this process by ensuring that the solutions in both half-cells remain neutral, allowing the current to continue flowing.

5. **Electrolytes in Salt Bridge**:
- Various electrolytes can be used in a salt bridge, such as potassium nitrate (KNO3), sodium chloride (NaCl), etc. This choice can affect the efficiency of the electrochemical cell.

### Conclusion:
Based on the analysis, the correct statements regarding the salt bridge include:
- It helps to complete the electrical circuit.
- It maintains the electrical neutrality of the solution in the two half-cells.
- It maintains the flow of electric current.