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  4. In which of the following crystals alternate tetrahedral voids are occupied ?

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Q. In which of the following crystals alternate tetrahedral voids are occupied ?

NTA AbhyasNTA Abhyas 2020The Solid State

Solution:

In ZnS structure, sulphides occupy all the lattice points while $Zn ^{2+}$ ions are present in alternative tetrahedral voids.
$NaCl$ has $FCC$ structure and $Na ^{+}$atom occupied all octahedral hole.
$CaF _2$ has $FCC$ structure and all Tholes will occupied by guest.
$Na _2 O$ has FCC sturcture and all Tholes wll occupied by guest.