Which of the following statements is incorrec | vedclass

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(C) $1$. In $ZnS$ (zinc blende structure),both $Zn^{2+}$ and $S^{2-}$ ions have a coordination number of $4$,so $(4,4)$ is correct.$2$. For $NaCl$ (ro

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$CsCl$ crystallizes in a body-centered cubic unit lattice.

Vedclass · Answer

(C) $1$. In $ZnS$ (zinc blende structure),both $Zn^{2+}$ and $S^{2-}$ ions have a coordination number of $4$,so $(4,4)$ is correct.$2$. For $NaCl$ (rock salt structure),the radius ratio $\frac{r_{+}}{r_{-}}$ lies between $0.414$ and $0.732$,which is correct.$3$. $CsCl$ crystallizes in a simple cubic lattice where $Cs^{+}$ occupies the body center,not a body-centered cubic $(BCC)$ lattice in the metallic sense. However,it is often described as having a $CsCl$ type structure with coordination $(8,8)$.$4$. In a diamond unit cell,there are $8$ carbon atoms: $8$ at corners,$6$ at face centers,and $4$ in tetrahedral voids. Total atoms = $(8 	imes \frac{1}{8}) + (6 	imes \frac{1}{2}) + 4 = 1 + 3 + 4 = 8$. This is correct.$5$. Upon re-evaluating,all statements provided are technically correct descriptions of their respective crystal structures. If one must be chosen as 'incorrect' in a standard context,it is often due to the distinction between $BCC$ (metallic) and $CsCl$ (ionic) lattices. However,given the options,all are factually accurate.

Which of the following statements is incorrect?

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