In which of the following structures coordination number for cations and anions in the packed structure will be same ?

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Cl– ions form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell

Ca2+ ions form fcc lattice and F– ions occupy all the eight tetrahedral voids of the unit cell

O2– ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell

S2– ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell

answer is A.

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Detailed Solution

In NaCl structure Cl- ion form ccp lattice unit cell and it touches 6 Na+ ions and Na+ occupies octahedral voids at middle of the edges and it touches 6 Cl- ions hence both ions having co-ordination number is 6

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