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Uttarakhand PMT Uttarakhand PMT Solved Paper-2011

  • question_answer
    Sodium metal crystallises in body centred cubic lattice with the cell edge\[a=4.29\overset{o}{\mathop{\text{A}}}\,\]. What is the radius of the sodium atom?

    A)  \[1.86\overset{o}{\mathop{\text{A}}}\,\]          

    B)  \[6.81\overset{o}{\mathop{\text{A}}}\,\]

    C)  \[8.61\overset{o}{\mathop{\text{A}}}\,\]          

    D)  \[2.94\overset{o}{\mathop{\text{A}}}\,\]

    Correct Answer: A

    Solution :

     For bcc unit cell, \[r=\frac{a\sqrt{3}}{4}\] \[=\frac{4.29\sqrt{3}}{4}\] \[=1.857\overset{o}{\mathop{\text{A}}}\,\]


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