NEET Sample Paper NEET Sample Test Paper-1

  • question_answer How many unit cells are present in a cube shaped ideal crystal of \[NaCl\] of mass\[1.00\text{ }g\]? [Atomic masses : \[Na=23,Cl=35.51\]]

    A)  \[5.14\times {{10}^{21}}\]             

    B)  \[1.28\times {{10}^{21}}\]

    C)  \[1.71\times {{10}^{21}}\]             

    D)  \[2.57\times {{10}^{21}}\]

    Correct Answer: D

    Solution :

    One unit cell of \[NaCl\] contains \[4\,\,NaCl\] units i.e.  has mass                                            \[=\frac{4\times 58.5}{6.02\times {{10}^{23}}}\,g\] \[\therefore \]   Number of unit cells in \[1\,g\]                 \[=\frac{6.02\times {{10}^{23}}}{4\times 58.5}=2.57\times {{10}^{21}}\]


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