Chemistry Equilibrium UHS 2022
PMDC Verified Question 49 of 102
The decrease in solubility of the salt in a solution that already contains an ion common to that salt is known as:
A
Le-Chatelier's principle
B
Solubility product
C
Common ion effect
D
\( K_{sp} \)
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Common ion effect
Concept:

This is the standard definition of a specific phenomenon that arises as a consequence of Le Chatelier's Principle in solubility scenarios.

Solution:

  • When an external ion identical to one in the salt is added, the overall concentration of that specific ion increases.


  • The equilibrium shifts left to precipitate the solid salt and lower the ionic concentration.


  • The specific term for this solubility decrease is the Common Ion Effect.


Why other options are incorrect:

While Le Chatelier's Principle is the underlying rule, "Common ion effect" is the specific term for this exact manifestation. Solubility product is a mathematical constant.

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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