Question

Assertion: When a Zn | Zn²⁺ electrode is connected to a standard hydrogen electrode, the electrons flow from zinc electrode to the hydrogen electrode.

Reason: The standard reduction potential of zinc electrode is lower than that of hydrogen electrode.

Options

• If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.

• If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion.

• If Assertion is CORRECT but Reason is INCORRECT.

• If Assertion is INCORRECT but Reason is CORRECT.

Answer 1

If both Assertion and Reason are CORRECT and Reason is the CORRECT explanation of the Assertion.

Explanation:

When a Zn | Zn²⁺ electrode is connected to a standard hydrogen electrode (SHE), the electrons flow from the zinc electrode to the hydrogen electrode. This is because the standard reduction potential of Zn²⁺ | Zn is −0.76 V, which is lower than the standard hydrogen electrode potential (0 V). Hence, zinc acts as the anode and undergoes oxidation, while hydrogen acts as the cathode and gets reduced.