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NEET Chemistry The Solid State / ठोस प्रावस्था Question Bank Self Evaluation Test - The Solid State

  • question_answer
    \[MgO\] crystallizes in a cubic type crystal system. The ionic radii for \[M{{g}^{2+}}\] and \[{{O}^{2-}}\] are 0.066 and 0.140 nm respectively. One can conclude that the \[M{{g}^{2+}}\] ions occupy

    A) a cubic hole in a simple cubic structure.

    B) every tetrahedral hole in a close packed structure.

    C) an octahedral hole in a cubic close packed structure.

    D) every other tetrahedral hole in a close packed structure.

    Correct Answer: C

    Solution :

    [c] \[\frac{{{r}_{c}}}{{{r}_{a}}}=\frac{0.066}{0.140}=0.47\] So, cation \[(M{{g}^{2+}})\] fitted in octahedral holes of \[{{O}^{2-}}\] are present at fee lattice point.


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