Which of the following statements is not about the voids ?

Options

A. NaCl
B. ZnS
C. `CaF_(2)`
D. `Na_(2)O`

Explanation

In ZnS structure, sulphide ions occupy all (fcc) lattice points while `Zn^(2+)` ions are present in alternate tetrahedral sites.
Fluorite, `CaF_(2)` has ccp arrangement of `Ca^(2oplus)` and `F^(Θ)` occupies all its tetrahedral voids.
Therefore, there is one `Zn^(2+)` ions for every `S^(2-)` ions.