Question

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

• A. NaCl
• B. ZnS
• C. $Ca{F}_2$
• D. $N{a}_{2}O$

Answer 1

Answer: (B)

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