NEET Sample Paper NEET Sample Test Paper-51

  • question_answer 70) In a CCP lattice of X and Y, X atoms are present at the comers while Y atoms are at face centres. Then the formula of the compound would be if one of the X atoms from a comer is replaced by Z atoms (also monovalent)?

    A) \[{{X}_{7}}{{Y}_{24}}{{Z}_{2}}~\]              

    B) \[{{X}_{7}}{{Y}_{24}}Z\]

    C) \[{{X}_{24}}{{Y}_{7}}Z\]                   

    D) \[Z{{Y}_{24}}Z\]

    Correct Answer: B

    Solution :

    \[X\,\,\,\,:\,\,\,\,\,7\times \,\frac{1}{8}\] \[Y\,\,\,\,:\,\,\,\,\,6\times \,\frac{1}{2}\] \[Z\,\,\,\,:\,\,\,\,\,1\times \,\frac{1}{8}\]   \[\begin{align}   & X\,\,\,\,Y\,\,\,\,Z \\  & \frac{7}{8}\,\,:\,\,3\,\,:\,\,\frac{1}{8} \\  & \frac{7\,\,:\,\,24\,\,:\,\,1}{8} \\ \end{align}\]

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