A) oxide ions have a cubic close packed arrangement and \[N{{a}^{+}}\] occupy all the eight tetrahedral voids
B) oxide ions have a cubic close packed arrangement and \[N{{a}^{+}}\] occupy all the octahedral voids
C) \[N{{a}^{+}}\] ions have a cubic close packed arrangement and \[{{O}^{2-}}\] occupy all the octahedral voids
D) \[{{N}^{+}}\] ions have a cubic close arrangement and \[{{O}^{2-}}\] occupy all the tetrahedral voids
Correct Answer: A
Solution :
In antifluorite structure, \[{{O}^{2-}}\] ions occupy half of the cubic holes and \[N{{a}^{+}}\] occupy all tetrahedral voids, eg, \[N{{a}_{2}}O\]. \[{{O}^{2-}}\] are surrounded by 8 \[N{{a}^{+}}\] ions and \[N{{a}^{+}}\] are surrounded by \[4\,{{O}^{2-}}\] ions. So, it has 4 : 8 coordination.
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