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KVPY Sample Paper KVPY Stream-SX Model Paper-10

  • question_answer
    Copper crystallises in \[fcc\]lattice with a unit cell edge of 361pm. The radius of copper atom is

    A) 108 pm            

    B) 128 pm

    C) 157 pm            

    D) 181 pm

    Correct Answer: B

    Solution :

    \[fcc\]lattice
    \[a=361\,\operatorname{pm}\]
    \[\operatorname{a}\sqrt{2}=4r\]
    \[\operatorname{r}=\frac{361\times \sqrt{2}}{4}=127.6\approx 128pm\]


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