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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
    How many lithium atoms are present in a unit cell with edge length \[3.5\overset{{}^\circ }{\mathop{A}}\,\] and density \[0.53\text{ }g\text{ }c{{m}^{-3}}\]? (Atomic mass of Li = 6.94)

    A) 2

    B) 1

    C) 4

    D) 6

    Correct Answer: A

    Solution :

    \[d=\frac{Z\times M}{{{N}_{A}}\times {{a}^{3}}}\] \[Z=\frac{{{a}^{3}}\times d\times {{N}_{A}}}{M}\] \[Z=\frac{{{(3.5\times {{10}^{-8}})}^{3}}\times 0.53\times 6.023\times {{10}^{23}}}{6.94}=1.97\approx 2\]


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