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JEE Main & Advanced JEE Main Paper (Held On 25 April 2013)

  • question_answer
                    Copper crystallizes in fcc with a unit length of 361 pm. What is the radius of copper atom?     JEE Main Online Paper ( Held On 25  April 2013 )

    A)                 157 pm                

    B)                                        128 pm

    C)                                        108 pm                

    D)                                        181 pm

    Correct Answer: B

    Solution :

                    For FCC, \[r=\frac{\sqrt{2}a}{4}=\frac{a}{2\sqrt{2}}=0.3535a\]given\[a=361pm\]\[r=0.3535\times 361\]\[=128pm\]


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