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NEET Sample Paper NEET Sample Test Paper-38

  • question_answer
     A metal has an fee latticed. The edge length of the unit cell is 404 pm. The density of the metal is \[2.72\,g\,c{{m}^{-3}}.\] The molar mass of the metal is (\[{{N}_{A}}\]Avogadro's constant\[=6.2\times {{10}^{23}}\,mo{{l}^{01}}\])

    A) \[30g\,mo{{l}^{-1}}\]   

    B) \[27g\,mo{{l}^{-1}}\]

    C) \[27g\,mo{{l}^{-1}}\]   

    D) \[~40gmo{{l}^{-1}}\]

    Correct Answer: B

    Solution :

     We know \[d=\frac{Z\times M}{V\times {{N}_{A}}}\] \[2.72=\frac{4\times M}{6.02\times {{10}^{23}}\times {{(404\times {{10}^{-10}})}^{3}}}\] \[\Rightarrow \]\[M=27\,g\,mo{{l}^{-}}\]


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