in which of the following structures coordination number for cations and anions in the packed structure will be same ?

Options

A. `Cl^(-)` ions form fcc lattice and `Na^(+)` ions occupy all octahedral voids of the unit cell
B. `Ca^(2+)` ions form fcc lattice and `F^(-)` ions occupy all the eight tetrahedral voids of the unit cell
C. `O^(2-)` ions form fcc lattice and `Na^(+)` ions occupy all the eight tetrahedral voids of the unit cell
D. `S^(2-)` ions form fcc lattice and `Zn^(2+)` ions go into alternate tetrahedral voids of the unit cell.

Answer

A

Explanation

In `Na^(+)Cl^(-)` all cations and anions have same copordination no. i.e., 6.