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NEET Chemistry The Solid State / ठोस प्रावस्था Question Bank Self Evaluation Test - The Solid State

  • question_answer
    How many unit cells are present in 5.0 gm of crystal AB (formula mass of AB = 40) having rock salt type structure? (\[{{N}_{A}}\]= Avogadro's no.)

    A) \[{{N}_{A}}\]             

    B) \[\frac{{{N}_{A}}}{10}\]

    C) \[4{{N}_{A}}\]         

    D) none of these

    Correct Answer: D

    Solution :

    [d] 4 formula units of AB are present in a unit cell \[\therefore \] no. of unit cell \[=\frac{4}{40}\times \frac{{{N}_{A}}}{4}\] \[\Rightarrow 0.025{{N}_{A}}\]


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