A) \[B{{a}^{2+}}\]
B) \[N{{i}^{2+}}\]
C) \[M{{g}^{2+}}\]
D) \[C{{a}^{2+}}\]
Correct Answer: D
Solution :
\[N{{i}^{2+}}\]is present in fourth group in the identification of basic radical other radicals are \[C{{O}^{2+}},Z{{n}^{2+}}\]and\[M{{n}^{2+}}\]The group reagent is hydrogen sulphide in ammoniacal solution. Radicals are precipitate as sulphide which are insoluble in\[N{{H}_{4}}OH\] \[CoS,\text{ }NiS\] forms Black ppt. \[MnS\] forms Buff ppt. \[ZnS\] forms white ppt.
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