Chemistry Electrochemistry ETEA 2024
PMDC Verified Question 9 of 73
The electrode potential of the standard hydrogen electrode is chosen as:
A
-1V
B
0V
C
1V
D
2V
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: 0V
Concept:

To measure the absolute potential of a single half-cell, it must be compared against a universal thermodynamic baseline.

Solution:

  • The global scientific community universally agreed to use the Standard Hydrogen Electrode (SHE) as this baseline.


  • By IUPAC convention, the Standard Electrode Potential (\( E^\circ \)) of the SHE is arbitrarily assigned an exact value of \( 0.00 \text{ V} \) at all temperatures.


  • All other standard reduction potentials on the electrochemical series are measured relative to this zero point.


Why other options are incorrect:

Using non-zero integers like \( 1 \text{ V} \) or \( -1 \text{ V} \) would needlessly complicate the mathematics of cell potential calculation.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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