A) \[B{{i}^{3+}},S{{n}^{4+}}\]
B) \[A{{l}^{3+}},H{{g}^{2+}}\]
C) \[Z{{n}^{2+}},C{{u}^{2+}}\]
D) \[N{{i}^{2+}},C{{u}^{2+}}\]
Correct Answer: A
Solution :
Both will precipitate as sulphide.
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