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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > In Na2O having antifluorite 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 O2− occupy all the octahedral voids (d) Na+ ions have a cubic close arrangement and O2− occupy all the tetrahedral voids.

In Na2O having antifluorite 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 O2− occupy all the octahedral voids (d) Na+ ions have a cubic close arrangement and O2− occupy all the tetrahedral voids.

Assertion : The presence of a large number of Schottky defects in NaCl lowers its density . Reason : In NaCl there are approximately 10^6 Schottky pairs per cm^3 at room temperature.