Question

Why is Standard hydrogen electrode called as the primary reference electrode?

(a) It has a known output potential

(b) It has a constant output potential

(c) Its output potential is independent of the composition of the solution

(d) Its output potential is zero volts

This question was posed to me in quiz.

I need to ask this question from Hydrogen and Glass Electrodes in portion pH Meters and Ion Analysers of Analytical Instrumentation

Answer 1

Right choice is (d) Its output potential is zero volts

For explanation: Standard hydrogen electrode is called the primary reference electrode as its output potential is zero volts. It is employed in conjunction with the indicator or working electrode.