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  5. The Solid State / ठोस प्रावस्था

12th Class Chemistry The Solid State / ठोस प्रावस्था Question Bank MCQs - The Solid State

  • question_answer
    The unit cell of aluminium is a cube with an edge length of 405 pm. The density of aluminium is \[2.70\text{ }g\text{ }c{{m}^{-\,3}}\]. What is the structure of unit cell of aluminium?

    A) Body-centred cubic cell

    B) Face-centred cubic cell

    C) End-centred cubic cell

    D) Simple cubic cell

    Correct Answer: B

    Solution :

    \[d=\frac{Z\times M}{{{N}_{A}}\times V}\Rightarrow 2.70=\frac{Z\times 27}{6.023\times {{10}^{23}}\times {{(405\times {{10}^{-10}})}^{3}}}\] Z = 4 Hence, structure of aluminium unit cell is fcc or face centred.


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