which of the following is not true about the ionic solids ?
(a)Bigger ions form the close packed structure
(b)smaller ions either occupy the tetrahedral or the octahedral voids depending upon their size
(c)Occupation of all voids is not necessary
(d)the fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids

Options

A. Bigger ions form the close packed structure
B. smaller ions either occupy the tetrahedral or the octahedral voids depending upon their size
C. Occupation of all voids is not necessary
D. the fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids

Answer

D

Explanation

the fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions present at the lattice points As , We known the radii of octahedral or tetradral void is related to radii of atoms ( r) as
Radius of octahedral void `(R_(0))=0.414r`
Radius of tetrahedral void `(R_(0))=0.225 r`
where , - r = radius of bigger atom involved.