Which of the following statement are correct for the ionic solids in which positive and negative ions are held by strong electrostatic attractive forces ?

Options

A. The ratio `(r^(+))/(r^(-))` increases as coordination number increases.
B. As the difference in size of ions increases coordination number increases.
C. When coordination number is eight, the `(r^(+))/(r^(-))` ratio lies between 0.225-0.414.
D. In ionic solid of the type AX (ZnS, Wurtzite) the coordination number of `Zn^(2+)` and `S^(2-)` respectively are 4 and 4.

Answer

C