Which of the following structures is not corr | vedclass

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(A) In $NaCl$ (rock salt) structure,$Cl^{-}$ ions form $ccp$ and $Na^{+}$ ions occupy all octahedral voids $(O.V.)$. This is correct.In $ZnS$ (zinc bl

Vedclass · Accepted Answer

$NaCl$ type $-$ $Cl^{-}$ ions in $ccp$ structure,$Na^{+}$ ions in all octahedral holes.

Vedclass · Answer

(A) In $NaCl$ (rock salt) structure,$Cl^{-}$ ions form $ccp$ and $Na^{+}$ ions occupy all octahedral voids $(O.V.)$. This is correct.In $ZnS$ (zinc blende) structure,$S^{2-}$ ions form $ccp$ and $Zn^{2+}$ ions occupy alternate tetrahedral voids. This is correct.In $CaF_2$ (fluorite) structure,$Ca^{2+}$ ions form $ccp$ and $F^{-}$ ions occupy all tetrahedral voids. This is correct.In $Na_2O$ (anti-fluorite) structure,$O^{2-}$ ions form $ccp$ and $Na^{+}$ ions occupy all tetrahedral voids. However,the stoichiometry requires $Na^{+}$ to be in all tetrahedral voids,which is correct. Wait,let us re-evaluate: $Na_2O$ has $O^{2-}$ in $ccp$ and $Na^{+}$ in all tetrahedral voids. This is correct. Actually,all options provided are technically correct descriptions of their respective structures. If forced to choose an error,$NaCl$ is often described as $Na^{+}$ in all $O.V.$ and $Cl^{-}$ in $ccp$. All statements are standard textbook descriptions.

Which of the following structures is not correctly matched?

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