Which pair will show the common ion effect?

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(C) The common ion effect is the suppression of the degree of dissociation of a weak electrolyte by the addition of a strong electrolyte containing a

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$NH_4OH + NH_4Cl$

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(C) The common ion effect is the suppression of the degree of dissociation of a weak electrolyte by the addition of a strong electrolyte containing a common ion.$NH_4OH$ is a weak base that dissociates as: $NH_4OH \rightleftharpoons NH_4^+ + OH^-$.$NH_4Cl$ is a strong electrolyte that dissociates completely as: $NH_4Cl \rightarrow NH_4^+ + Cl^-$.Due to the presence of the common ion $NH_4^+$,the equilibrium of $NH_4OH$ shifts to the left,suppressing its dissociation. Thus,the pair $NH_4OH + NH_4Cl$ shows the common ion effect.

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