Which is not an example of common ion effect?

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(C) The common ion effect is the suppression of the degree of dissociation of a weak electrolyte in the presence of a strong electrolyte that shares a

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$CH_{3}COOH + NaOH$

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(C) The common ion effect is the suppression of the degree of dissociation of a weak electrolyte in the presence of a strong electrolyte that shares a common ion. In the mixture $CH_{3}COOH + NaOH$,the reaction $CH_{3}COOH + NaOH \rightarrow CH_{3}COONa + H_{2}O$ occurs,which is a neutralization reaction,not an example of the common ion effect. In the other options,$AgCl$ in $NaCl$,$H_{2}S$ in $HCl$,and $NH_{4}OH$ in $NH_{4}Cl$ all involve the presence of a common ion that suppresses dissociation.

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