Amongst the following electrodes the one with zero electrode potential is

Options

A. Calomel electrode
B. Standard hydrogen electrode
C. Glass electrode
D. Gas electrode

Explanation

To determine which electrode has a zero electrode potential, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Electrode Potential**: Electrode potential is a measure of the tendency of an electrode to gain or lose electrons. It is measured in volts (V).

2. **Identify Standard Reference Electrode**: The standard hydrogen electrode (SHE) is the reference electrode against which all other electrodes are measured. It is defined to have an electrode potential of 0 volts under standard conditions (1 M H⁺ concentration, 1 atm pressure of H₂ gas, and a temperature of 25°C).

3. **List the Given Electrodes**: In this question, we need to identify which among the given electrodes has a zero electrode potential. The common electrodes to consider are:
- Standard Hydrogen Electrode (SHE)
- Glass Electrode
- Other metal electrodes (like Ag/Ag⁺, Cu/Cu²⁺, etc.)

4. **Evaluate Each Electrode**:
- **Standard Hydrogen Electrode**: As mentioned, it has a defined potential of 0 V.
- **Glass Electrode**: Typically used for measuring pH, its potential is not zero.
- **Other Metal Electrodes**: Each of these has a specific electrode potential that is not zero.

5. **Conclusion**: The only electrode with a zero electrode potential is the **Standard Hydrogen Electrode (SHE)**.

### Final Answer:
The electrode with zero electrode potential is the **Standard Hydrogen Electrode (SHE)**.

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