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  • 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.

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) Ca^{2+} ions form fcc lattice and F^{-} ions occupy all the eight tetrahedral voids of the unit cell.

(iii) O^{2-}ions form fcc lattice and Na^{+} ions occupy all the eight tetrahedral voids of the unit cell.

(iv) S^{2-} ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.

Answers (1)

The answer is the option (i).

In  NaCl (Rock salt) structure, the anions have face centered cubic arrangement and all the octahedral voids of given unit cell are occupied by the cation Na^{+}
Where, C.N of Na^{+} = 6
C.N of Cl^{-}= 6

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