1.

Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces.

Answer»

The radius `r^(+)//r^(-)` INCREASES as coordination number increases.
As the difference in size of ions increases, coordination number increases.
When coordination number is eight, the `r^(+)//r^(-)` ratio lies between 0.732 to 1.000
In ionic SOLID of the TYPE Ax(ZnS, Wurtzite) the coordination number of `Zn^(2+)` and `S^(2-)` RESPECTIVELY are 4 and 4.

Solution :When coordination number is eight , the radius ratio `(r^(+))/(r^(-))` lies between 0.732 to 1.000.


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