• # question_answer 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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