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Common-ion effect occurs when
Aadding a salt with a common ion suppresses dissociation of a weak electrolyte
Ban inert ion shifts equilibrium (typical)
Ctemperature is changed
Dtwo non-reacting salts are mixed
Answer & Solution
Correct answer: A. adding a salt with a common ion suppresses dissociation of a weak electrolyte
1. Adding a salt that shares an ion with the dissociating equilibrium increases that ion's concentration.
2. By Le Chatelier's principle, the equilibrium shifts back toward the undissociated form.
3. Hence dissociation of the weak electrolyte is suppressed.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 3 "Ionic Equilibria" §3.8_
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