Question

.In which of the following structures coordination number for cations and anions in the packed structure will be same? (i) Cl– ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell. (ii) Ca2+ ions form fcc lattice and F– ions occupy all the eight tetrahedral (iii) O2- ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell. (iv) S2- ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.

Answer 1

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Explanation:

(i) Cl- ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell. (ii) Ca2+ ions form fcc lattice and F - ions occupy all the eight tetrahedral voids of the unit cell. (iii) O2- ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell.