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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2004

  • question_answer
    The number of atoms in unit cell of \[NaCl\]crystal is

    A)  \[2\]                                    

    B)  \[4\]

    C)  \[6\]                                    

    D)  \[8\]

    Correct Answer: B

    Solution :

    \[NaCl\]has face centred cubic structure. In it the number of atoms per unit cell. Number of atoms at comer \[=8\times \frac{1}{8}=1\] Number of atoms at face centre \[=6\times \frac{1}{2}=3\] Total no. of atoms \[~=4\]


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