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Manipal Medical Manipal Medical Solved Paper-2004

  • question_answer
    The limiting radius ratio for tetrahedral shape is:

    A)  0 to 0.155

    B)  0.225 to 0.414

    C)  0.155 to 0.225

    D)  0.414 to 0.732

    Correct Answer: B

    Solution :

     The limiting radius ratios (of cation and anion) play a very important role in giving a due to the nature of crystal. structure of the ionic substance.
    S. No. Limiting Shape ratio \[(r+/r-)\] Shape Co-ordi-nation number Example
    1. Less than Linear 2 or 3 \[{{B}_{2}}{{O}_{3}}\]
    2. 0.225-0.441 Tetrathe-dral 4 \[CuCl,\] \[CuBr,\] \[Bas,\] \[CuI\]
    3. 0.414-0.732 Square planer for 4 and octahed ral for 8 4 or 6 \[MgO,\] \[NaBr,\] \[MnO,\] \[KBr,\] \[AgCl,\] \[NaCl\]


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