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(D) In $NaCl$ (rock salt structure),the $Cl^-$ ion has a coordination number of $6$.In $ZnS$ (zinc blende structure),the $S^{2-}$ ion has a coordinati

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$Na_2O$

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(D) In $NaCl$ (rock salt structure),the $Cl^-$ ion has a coordination number of $6$.In $ZnS$ (zinc blende structure),the $S^{2-}$ ion has a coordination number of $4$.In $CaF_2$ (fluorite structure),the $F^-$ ion has a coordination number of $4$.In $Na_2O$ (anti-fluorite structure),the $O^{2-}$ ion has a coordination number of $8$.Therefore,the anion with the maximum coordination number is $O^{2-}$ in $Na_2O$.

In which of the following structures,the anion has the maximum coordination number?

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