Which pair will show common ion effect [MP PMT 1990, 99; Pb. PMT 2001]

1.	Which pair will show common ion effect [MP PMT 1990, 99; Pb. PMT 2001]
A.	\[BaC{{l}_{2}}+Ba\,{{(N{{O}_{3}})}_{2}}\]
B.	\[NaCl+HCl\]
C.	\[N{{H}_{4}}OH+N{{H}_{4}}Cl\]
D.	\[AgCN+KCN\]
Answer» D. \[AgCN+KCN\]

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Which pair will show common ion effect [MP PMT 1990, 99; Pb. PMT 2001]

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