Which of the following pair will not show
common ion effect :
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Explanation:
Common ion effect is observed when a solution of weak electrolyte is mixed with a solution of strong electrolyte which provides an ion common to that provided by a weak electrolyte.
Ammonium hydroxide is a weak electrolyte and ammonium chloride is a strong electrolyte. Ammonium chloride provides ammonium ions common to ammonium hydroxide.
Thus, the pair NH4OH+NH4Cl shows common ion effect.
All other pairs have a mixture of strong electrolytes mixed with strong electrolyte hence they do not show common ion effect.
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