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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    A metal is said to be diamagnetic if it does not have any unpaired electron. Among the following, which one is diamagnetic?

    A)  \[C{{o}^{2+}}\]                    

    B)  \[C{{u}^{2\text{+}}}\]

    C)  \[M{{n}^{2\text{+}}}\]                      

    D)  \[S{{c}^{3\text{+}}}\]

    Correct Answer: D

    Solution :

    Metal ion Electronic configuration
    \[S{{c}^{3+}}\] \[\left[ Ar \right]\,\,4{{d}^{0}}\]
    \[M{{n}^{2+}}\] \[\left[ Ar \right]\,\,4{{d}^{5}}\]
    \[C{{o}^{2+}}\] \[\left[ Ar \right]\,\,4{{d}^{7}}\]
    \[C{{u}^{2+}}\] \[\left[ Ar \right]\,\,4{{d}^{9}}\]
    \[S{{c}^{3+}}\] has no unpaired electron, hence it is diamagnetic.


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