Chemistry Electrochemistry NUMS 2023
PMDC Verified Question 23 of 73
During electrolysis, reduction always occurs at the:
A
Anode
B
Cathode
C
SHE
D
Salt bridge
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Cathode
Concept:

The nomenclature for electrochemical electrodes is strictly tied to the type of chemical reaction occurring at their surface.

Solution:

  • By universal IUPAC definition, the cathode is the electrode where reduction (gain of electrons) takes place.


  • The anode is the electrode where oxidation (loss of electrons) takes place.


  • This holds true whether the cell is galvanic (spontaneous) or electrolytic (forced via an external power source). The mnemonic "RED CAT" (Reduction at Cathode) is always reliable.


Why other options are incorrect:

Oxidation occurs at the anode. The salt bridge is a pathway for spectator ions, not a site of electron transfer.

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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