Assertion:A standard hydrogen electrode is also called reversible electrode.
Reason : Standard hydrogen electrode can act both as anode as well as cathode in an electrochemical cell.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion .
B. If both assertion and reason are true but reason is not the correct explanation of assertion .
C. If assertion is true but reason is false .
D. If both assertion and reason are false .

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "A standard hydrogen electrode is also called a reversible electrode."
- A standard hydrogen electrode (SHE) is defined as a reference electrode that can undergo the half-reaction of hydrogen ions (H⁺) gaining electrons to form hydrogen gas (H₂) and vice versa. This ability to undergo both oxidation and reduction reactions makes it reversible.
- Therefore, the assertion is **correct**.

2. **Understanding the Reason**:
- The reason states that "Standard hydrogen electrode can act both as anode as well as cathode in an electrochemical cell."
- In an electrochemical cell, the SHE can act as an anode when it is oxidizing hydrogen gas to hydrogen ions (H⁺) and as a cathode when it is reducing hydrogen ions (H⁺) to hydrogen gas (H₂). This dual functionality is due to its standard potential being zero, allowing it to serve as a reference point for other half-reactions.
- Thus, the reason is also **correct**.

3. **Connecting Assertion and Reason**:
- The reason explains why the assertion is true. The SHE's ability to act as both anode and cathode is what makes it reversible.
- Therefore, the reason is a correct explanation of the assertion.

4. **Conclusion**:
- Both the assertion and the reason are true, and the reason correctly explains the assertion. Thus, the answer to the question is that both the assertion and reason are correct, and the reason is the correct explanation of the assertion.

### Final Answer:
Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.

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