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JEE Main & Advanced Sample Paper JEE Main Sample Paper-33

  • question_answer
    Lithium forms body centered cubic structure. Atomic radius of the lithium is 152 pm, then length of the side of its unit cell is:

    A)  75pm     

    B)                                     351pm

    C)  304pm        

    D)                     152pm

    Correct Answer: B

    Solution :

    For BCC structure \[\sqrt{3}\,a=4r\,a\]             \[=\frac{4R}{\sqrt{3}}=\frac{4}{\sqrt{3}}\,\times 152\,=351\,\,pm\]


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