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NEET NEET SOLVED PAPER 2016 Phase-II

  • question_answer
    In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion \[(C{{a}^{2+}})\] and fluoride ion\[({{F}^{-}})\]are

    A)  4 and 2           

    B)  6 and 6

    C)  8 and 4           

    D)  4 and 8

    Correct Answer: C

    Solution :

    In \[Ca{{F}_{2}},C{{a}^{2(+)}}\] has fcc arrangement and\[{{f}^{(-)}}\]ions are present in all tetrahedral voids. ∴ Cp-ordination numbers for\[C{{a}^{2(+)}}\]and\[{{f}^{(-)}}\]ions are 8 and 4.


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