Which statement is not correct?

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(A) In $ZnS$ (Zinc blende),$Zn^{+2}$ and $S^{-2}$ ions both have a coordination number of $4$,so $4:4$ is correct.In $CaF_2$ (Fluorite),$Ca^{+2}$ is i

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Zinc blende has $4:4$ coordination

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(A) In $ZnS$ (Zinc blende),$Zn^{+2}$ and $S^{-2}$ ions both have a coordination number of $4$,so $4:4$ is correct.In $CaF_2$ (Fluorite),$Ca^{+2}$ is in $8$-coordination and $F^{-}$ is in $4$-coordination,so $8:4$ is correct.In $Na_2O$ (Antifluorite structure),the cation $Na^{+}$ has a coordination number of $4$ and the anion $O^{-2}$ has a coordination number of $8$. Thus,the coordination ratio is $4:8$,which is correct.In $NaCl$ (Rock salt),both $Na^{+}$ and $Cl^{-}$ ions have a coordination number of $6$,so $6:6$ is correct.Wait,re-evaluating the options: All statements provided are actually correct based on standard crystal structures. However,if forced to choose,let's re-verify $Na_2O$. $Na_2O$ is an antifluorite structure where $O^{-2}$ occupies $FCC$ sites (coordination $8$) and $Na^{+}$ occupies all tetrahedral voids (coordination $4$). The ratio is $4:8$. All statements are factually correct. Given the prompt,there might be a typo in the question's premise,but based on standard chemistry,all are correct.

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