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JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank Crystal packing

  • question_answer
    In the rock salt structure, the number of formula units per unit cell is equal to

    A)                 1             

    B)                 2

    C)                 3             

    D)                 4

    Correct Answer: D

    Solution :

    In \[NaCl\] (rock salt) : Number of \[N{{a}^{+}}\]ions \[=12\] (at edge centers)\[\times \frac{1}{4}+1\](at body centre)\[\times 1=4\]. Number of \[C{{l}^{-}}\]ions \[=8\] (at corners)\[\times \frac{1}{8}+6\] (at face centre) \[\times \frac{1}{2}=4\]. Thus 4 formula units per unit cell.


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