Chemistry Electrochemistry MDCAT 2018
PMDC Verified Question 58 of 73
The standard electrode potential of hydrogen is arbitrarily taken at 298k is ____.
A
1.00 volt
B
0.10 volt
C
0.00 volt
D
10.0 volt
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 0.00 volt
Concept:

Standard reduction potentials cannot be measured in absolute terms; they require a baseline reference electrode to calculate relative potential differences.

Solution:

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


  • By IUPAC convention, the standard electrode potential of SHE is assigned an arbitrary, exact value of \( 0.00 \text{ V} \) at all temperatures (including standard \( 298 \text{ K} \)).


Why other options are incorrect:

Values like \( 1.00 \text{ V} \) or \( 0.10 \text{ V} \) are simply random numbers. The entire thermodynamic table of standard potentials revolves around Hydrogen being exactly zero.

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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