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 `r^+//r^-` increases as coordination number increases
B. As the differnce in size of ions increases, coordination number increases
C. When coordination number is eight , the `r^+//r^-` ration lies between 0.225 to 0.414 .
D. Coordinationumber of `Zn^(2+) " and " S^(2-)` respectively are 4 and 4

Answer

C

Explanation

when coordination number is eight , the radius ratio `r^+/r^-` lies between 0.732 to 1.000