1.

Which set of following characteristics for ZnS crystal is correct?

Answer»

Coordination NUMBER (4 : 4), ccp, `Zn^(++)` ion in the alternate tetrahedral voids
Coordination number (6:6), hcp, `Zn^(++)` ion in all tetrahedral voids.
Coordination number (6:4), hcp, `Zn^(++)`ion in all OCTAHEDRAL voids
Coordination number (4 : 4), ccp, `Zn^(++)`ion in all tetrahedral voids.

Solution :ZnS has cubic CLOSE packed (ccp) structure. The `S^(2-)`ions are PRESENT at the corners 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 sulphide ions which are disposed towards the corners of a regular tetrahedron. Similarly, SP-ion is surrounded by four `Zn^(2+)`ions.


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