Chemistry Solids PMC 2021
PMDC Verified Question 45 of 54
Current in electrolysis is carried through:
A
Free electrons
B
Positive ions
C
Negative ions
D
Both B and C
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Both B and C
Concept:
Electrical conduction in different mediums relies on different types of mobile charge carriers.

Solution:
  • In metallic conduction (like wires), current is carried by free electrons.
  • However, in an electrolytic cell (electrolysis), the conduction occurs through a molten liquid or an aqueous solution containing dissolved electrolytes.
  • Here, the charge carriers are the actual mobile positive ions (cations) migrating to the cathode and negative ions (anions) migrating to the anode.
  • Therefore, current in the electrolyte is carried by both positive and negative ions.


Why other options are incorrect:
  • A: Free electrons carry current in the external wire electrodes, but not through the electrolyte solution itself.

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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