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Uttarakhand PMT Uttarakhand PMT 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 radius ratio \[(r+r-)\] Shape Co- ordi-nation number Example
    1. Less than 0.225 Linear 2 or 3 \[{{B}_{2}}{{O}_{3}}\]
    2. 0.225- 0.414 Tetrahe-dral 4 \[CuCl,\]\[CuBr,\]\[BaS,CuI\]
    3. 0.414- 0.732 Square planer for 4 and octahed ral for 8 4 or 6 \[MgO,\]\[NaBr,\]\[MnO,\] \[KBr,\] \[AgCl,\] \[NaCl\]
    4. 0.732- more Cube 8 \[CsI,CsBr,\] \[N{{H}_{4}}Br\]


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