Chemistry Electrochemistry ETEA 2022
PMDC Verified Question 30 of 73
A cathode has the reduction potential:
A
Less than the anode
B
More than the anode
C
Same as that of anode
D
Zero
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: More than the anode
Concept:

In any standard electrochemical cell, the half-cell with the stronger "pull" on electrons will force the other half-cell to give them up.

Solution:

  • Reduction potential is literally a measure of a species' tendency to acquire electrons and undergo reduction.


  • The cathode is defined strictly as the electrode where reduction occurs.


  • Therefore, to spontaneously drive electrons from the anode to the cathode, the cathode must possess a higher (more positive) reduction potential than the anode.


Why other options are incorrect:

If the cathode had a lesser reduction potential, it would act as the anode instead. If they were the same, no potential difference would exist and the cell voltage would be 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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