Question

43. Arrangement of Sulphide ions in Zinc blende is .....

(A) FCC

(B) BCC

(C) HCP

(D) Simple cubic​

Answer 1

Answer : The correct option is, (A) FCC

Explanation :

As we know that zinc sulfide exists in two forms which are, ZnS Blende, ZnS Wurtzite.

The structure of ZnS Blende has cubic close packing (ccp) arrangement in which the sulfide ions $(S^{2-})$ occupy face centered cubic lattice points (FCC) and the zinc ions $(Zn^{2+})$ occupy half of the total number of tetrahedral voids.

In this structure, each sulfide ion is surrounded by 4 zinc ions and each zinc ion is surrounded by 4 sulfide ions. Therefore, ZnS has 4 : 4 coordination.

Hence, the arrangement of Sulfide ions in Zinc blende is, (A) FCC