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Punjab Medical Punjab - MET Solved Paper-2006

  • question_answer
    The stability of complexes of\[C{{u}^{2+}},\,\,N{{i}^{2+}},\,\,C{{o}^{2+}}\]and \[F{{e}^{2+}}\] varies in the order:

    A) \[C{{u}^{2+}}>N{{i}^{2+}}>C{{o}^{2+}}>F{{e}^{2+}}\]

    B) \[C{{u}^{2+}}>F{{e}^{2+}}>N{{i}^{2+}}>C{{o}^{2+}}\]

    C) \[N{{i}^{2+}}>C{{o}^{2+}}>F{{e}^{2+}}>C{{u}^{2+}}\]

    D) \[C{{u}^{2+}}>N{{i}^{2+}}>C{{o}^{2+}}>F{{e}^{2+}}\]

    Correct Answer: D

    Solution :

    When cations have some charge but number of \[d-\]electrons are different then the stability (or CFSE) decrease with increase in the number of \[d-\]electrons. Therefore, the correct order is:                 \[F{{e}^{2+}}>C{{o}^{2+}}>N{{i}^{2+}}>C{{u}^{2+}}\]


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