Question

Electrode potential of an electrode is its potential against a reference electrode like:

• A. iron electrode
• B. platinum electrode
• C. silver electrode
• D. standard hydrogen electrode.

Answer 1

The correct option is D standard hydrogen electrode.

A reference electrode is an electrode which has a stable and well-known electrode potential.
Electrode potential of a electrode is its potential against Standard hydrogen electrode as a reference electrode. For reference, hydrogen's standard electrode potential ($E^o$) is declared to be zero at all temperatures.