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 – increase 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 Sv2- respectively are 4 and 4
Ans. c
(8)