Q. In which of the following crystals alternate tetrahedral voids are occupied?
A) $NaCl$
B) $Zns$
C) $CaF_{2}$
D) $Na_{2}O$
Explanation
(b)
In $ZnS\$structure, sulphide ions occupy all (fcc) lattice points while $Zn^{2 +}$ ions are present in alternate tetrahedral sites.
Therefore, there is one $Zn^{2 +}$ ion for every $S^{2 - \ }$ ion.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.