In

Na₂ O having antiflourite structure

a. Oxide ions have a cubic close packed arrangement and Na⁺  occupy all the eight tetrahedral voids

b. Oxide ions have a cubic close packed arrangement and Na⁺ occupy all the octahedral voids

c. Na⁺  ions have a cubic close packed arrangement and O^2-  occupy all the  octahedral voids

d.Na⁺ ions have a cubic close arrangement and O^2-  occupy all the octahedral all the octahedral voids

Ans. a

(40)