NEET Sample Paper NEET Sample Test Paper-14

  • question_answer 71) Which one of the following ions will give a coloured solution?

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

    B)  \[F{{e}^{2}}^{+}\]

    C) \[Z{{n}^{2+}}\]                              

    D) \[A{{g}^{+}}\]  

    Correct Answer: B

    Solution :

    Since\[\text{F}{{\text{e}}^{\text{2+}}}\]has unpaired electrons so, d-d transitions would take place and hence, its solution would be coloured. \[C{{u}^{+}}\to 3{{d}^{10}}\] \[F{{e}^{2+}}\to 3{{d}^{6}}\] \[Z{{n}^{2+}}\to 3{{d}^{10}}\] \[A{{g}^{+}}\to 4{{d}^{10}}\] Hence, the correct option is [b].

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