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NEET Sample Paper NEET Sample Test Paper-55

  • question_answer
    A solid \[{{X}^{+}}\,\,\,{{Y}^{-}}\] has a bcc structure. If the distance of closest approach between the two atoms is 173 pm, the edge length of the cell is

    A) 200 pm            

    B) \[\sqrt{\frac{3}{2}}\,pm\]

    C) 142.2pm                       

    D) \[\sqrt{2}\,pm\]

    Correct Answer: A

    Solution :

    For bcc unit cell, \[d=\frac{\sqrt{3}}{2}\,\,\times \,\,a\] \[or\,\,a\,\,=\,\,\frac{2d}{\sqrt{3}}\,\,=\,\,\frac{2\times 173}{\sqrt{3}}\,\,\,\approx \,\,200\,pm\]


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