JEE Main & Advanced Chemistry The d-and f-Block Elements Question Bank Critical Thinking

  • question_answer Which of the following ions form most stable complex compound [MP PMT 1995]

    A) \[C{{u}^{++}}\]

    B) \[N{{i}^{++}}\]

    C) \[F{{e}^{++}}\]

    D) \[M{{n}^{++}}\]

    Correct Answer: A

    Solution :

    The magnitude of stability constants for some divalent metal ions of the first transition series with oxygen or nitrogen donar ligands increases in the order. \[M{{n}^{2+}}<F{{e}^{2+}}<C{{o}^{2+}}<N{{i}^{2+}}<C{{u}^{2+}}<Z{{n}^{2+}}\]


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