Question

A galvanic cell can behave as an electrolytic cell when:

• A. \( E_{cell} = E_{ext} \)
• B. \( E_{cell}>E_{ext} \)
• C. \( E_{cell} = 0 \)
• D. \( E_{ext}>E_{cell} \)

Hint:

To convert a galvanic cell into an electrolytic one, apply an external potential greater than its own cell potential.

Answer 1

The Correct Option is D

Step 1: A galvanic cell generates electricity due to its cell potential (\( E_{cell} \)).
Step 2: To force the reaction to proceed in the opposite direction (as an electrolytic cell), an external voltage must be applied that is greater than the cell’s potential.
\[ E_{ext}>E_{cell} \] Step 3: When this condition is met, the external source drives the non-spontaneous reaction by reversing the electron flow.