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JEE Main & Advanced Sample Paper JEE Main Sample Paper-44

  • question_answer
    How many effective \[N{{a}^{+}}\]and \[C{{l}^{-}}\]ions are present respectively in a unit cell of \[NaCl\] solid (Rock salt structure) if ions along line connecting opposite face centres are absent?

    A)  3, 3                            

    B) \[\frac{7}{2},\,4\]

    C) \[\frac{7}{2},\,\,\frac{7}{2}\]            

    D)  \[4,\,\,\frac{7}{2}\]

    Correct Answer: A

    Solution :

     Number of \[N{{a}^{+}}=4-1=3\] Number of \[C{{l}^{-}}=4-2\times \frac{1}{2}=3\]


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