Chemistry Electrochemistry ETEA 2024
PMDC Verified Question 8 of 73
Which one of the following is a strong electrolyte in solution?
A
Acetic acid
B
Ammonium hydroxide
C
Carbonic acid
D
Potassium iodide
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Potassium iodide
Concept:

A strong electrolyte is a substance that dissociates nearly 100% into free, mobile ions when dissolved in water.

Solution:

  • Potassium Iodide (\( KI \)) is an ionic salt.


  • Because it is highly soluble, it completely shatters its crystal lattice in water to yield independent \( K^+ \) and \( I^- \) ions.


  • This massive presence of free ions allows the solution to conduct electricity extremely well, categorizing it as a strong electrolyte.


Why other options are incorrect:

Acetic acid and carbonic acid are weak covalent acids that only partially ionize. Ammonium hydroxide is a weak base that also only partially dissociates.

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