Which pair will show the common-ion effect? (A) \( \mathrm{MgCl}_{2} \) and \( \mathrm{Mg}\left(...

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Which pair will show the common-ion effect?
(A) \( \mathrm{MgCl}_{2} \) and \( \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2} \)
(B) \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2} \) and \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{3} \mathrm{Cl} \)
(C) \( \mathrm{KCl} \) and \( \mathrm{HCl} \)
(D) \( \mathrm{AuCl}_{3} \) and \( \mathrm{Au}(\mathrm{OH})_{3} \)
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