Question

Point out the correct statement for the set of characteristics of ZnS crystal.
A. Coordination number (4:4), ccp,`Zn^(2+)` ion in all the alternate tetrahedral voids
B. Coordination number (6:6), hcp,`Zn^(2+)` ion in all the alternate tetrahedral voids
C. Coordination number (6:4), hcp,`Zn^(2+)` ion in all the alternate octahedral voids
D. Coordination number (4:4), ccp,`Zn^(2+)` ion in all the tetrahedral voids

Answer 1

(a) ZnS has zinz blende type structure . The `S^(2-)` ions are present at the corers of the cube and at the centre of each face. Zinc ions occupy half of the tetrahedral sites. Each zinc ion is surrounded by four sulphate sites. Each zinc ion is surrounded by four sulphide ions which are disopsed towards the corner of regular tetrahedruon. Similarly, `S^(2-)` ion is surrounded by four `Zn^(2+)` ions.