The standard reduction potential of the given half cell, H+(aq) + e− → ½H2, is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 0 V
The standard hydrogen electrode is the reference electrode, and by convention its reduction potential is zero:
\( \displaystyle \ce{H^+(aq) + e^- -> 1/2 H2(g)} \qquad E^{\circ}=0\ \mathrm{V} \)
NCERT (2026-27 edition):
Measurement of Electrode Potential
