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 radius 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 `r_(+)//r_(-)` ratio lies between `0.225 " to" 0.414`
D. In ZnS type structure, anions have ccp arrangement and cations occupy alternate tetrahedral voids. The coordination number of `Zn^(2+)` and `S^(2-)` respectively are 4 and 4

Answer

C

Explanation

When the co-ordiantion number is `8, r_(+)//r_(-)` ratio lies between `0.732-1`