Chemistry Electrochemistry BUMHS 2024
PMDC Verified Question 13 of 73
Electric current in solutions is carried by:
A
Ions
B
Canal rays
C
Free protons
D
Free electrons
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Ions
Concept:

Electrical conductivity requires physical charge carriers that are free to move under the influence of an electric field.

Solution:

  • In metallic wires, electric current is carried by a "sea" of delocalized, free electrons.


  • However, in electrolytic or aqueous solutions, free electrons cannot exist in the solvent.


  • Instead, the current is exclusively carried by the physical migration of hydrated ions (positive cations moving toward the cathode, and negative anions moving toward the anode).


Why other options are incorrect:

Canal rays are beams of positive ions generated in a vacuum tube. Free protons do not carry bulk current. Free electrons only carry current in solids, not solutions.

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