Question

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.

• 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 1

Answer: (A)

Depending on the other cell used, it can turn $H^{+}$ions into hydrogen gas, or it can turn hydrogen gas into $H^{+}$ions. It acts as cathode if the other cell is less reduction potential than Hydrogen and can act as anode if the other cell is more reduction potential than Hydrogen. Since it can act both anode as well as cathode, it is called a reversible electrode.