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NEET NEET SOLVED PAPER 2015 (C)

  • question_answer
    A given metal crystallizes out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?                                                                             

    A)  40 pm                  

    B)  127 pm               

    C)         80 pm 

    D)         108 pm

    Correct Answer: B

    Solution :

    Given, edge length = 361 pm Four metal atoms in one unit cell i.e. effective number in unit cell (z) = 4 (given) \[\therefore \] It is a FCC Structure \[\therefore \] Face diagonal = 4r \[\sqrt{2}a=4r\Rightarrow r=\frac{\sqrt{2}+361}{4}=127pm\]


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