Q. Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces?
A) The radius $r^{+}/r^{-}$ 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 to 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
Explanation
(c)
When coordination number is eight, the radius ratio $\frac{r^{+}}{r^{-}}$ lies between 0.732 to 1.000.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.