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JEE Main & Advanced AIEEE Paper (Held On 11 May 2011)

  • question_answer
    25.          Copper crystallises in fee lattice with a unit cell edge of 361 pm. The radius of copper atom is:     AIEEE  Solved  Paper (Held On 11 May  2011)

    A)  108pm         

    B)  128pm         

    C)  157pm         

    D)  181pm

    Correct Answer: B

    Solution :

                                    FCC lattice a = 361 pm \[a\sqrt{2}=4r\] \[r=\frac{361\times \sqrt{2}}{4}=127.6\approx 128pm.\]


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