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AIIMS AIIMS Solved Paper-2007

  • question_answer
    If \[AgI\] crystallizes in zinc blende structure with \[{{I}^{-}}\] ions at lattice points. What fraction of tetrahedral voids is occupied by \[A{{g}^{+}}\] ions?

    A)  25%                      

    B)         50%                      

    C)  100%                   

    D)         75%

    Correct Answer: B

    Solution :

    In \[Agl\] crystal, number of \[A{{g}^{+}}\] ions is equal to \[{{I}^{-}}\] ions. However, the number of tetrahedral voids are twice the number of atoms forming the cubic lattice. \[\therefore \] Number of tetrahedral voids occupied by \[A{{g}^{+}}\] ion = 50%


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