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Q.

Which of the following is not true about the ionic solids?

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a

Bigger ions form the close packed structure

b

Smaller ions occupy either the tetrahedral or the octahedral voids depending upon their size.

c

Occupation of all the voids is not necessary.

d

The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions occupying the voids

answer is D.

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Detailed Solution

The fraction of octahedral or tetrahedral voids occupied depends upon the radii of the ions present at the lattice points. As we know the radii of octahedral or tetrahedral void isrelated to radii of atoms (r) as Radius of octahedral void (Ro) = 0.414 rRadius of tetrahedral void (Rt) = 0.225 rwhere, r = radius of bigger atom involved.
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