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JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank Crystal structure and Coordination number

  • question_answer
    In the calcium fluoride structure the co-ordination number of the cation and anions are respectively       [J & K  2005]

    A) 6, 6        

    B) 8, 4

    C) 4, 4        

    D) 4, 8

    Correct Answer: B

    Solution :

    The \[C{{a}^{2+}}\] ions are arranged in (ccp) arrangement, i.e. \[C{{a}^{2+}}\] ions are present at all corners and tat the center of each face of the cube. the fluoride ions occupy all the tetrahedral sites. This is 8 : 4 arrangement i.e., each \[C{{a}^{2+}}\] ion is surrounded by \[8{{F}^{-}}\] ions and each \[{{F}^{-}}\] ion by four \[C{{a}^{2+}}\] ions.


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