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JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank Topic Test - Solid State

  • question_answer
    In normal spinel structures \[MgA{{l}_{2}}{{O}_{4}},\] the percentage of tetrahedral void occupied is

    A) 12.5%

    B) 25%      

    C) 50%

    D) None of these

    Correct Answer: A

    Solution :

    [a] Oxygen forms fcc structure in which \[M{{g}^{2+}}\] occupies tetrahedral voids and \[A{{l}^{3+}}\] ions occupies octahedral void per unit cell. Total number of tetrahedral voids \[=2\times 4=8\] \[\therefore \] % tetrahedral void occupied \[=\frac{1}{8}\times 100\] \[=12.5%\]


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