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

(i) Clion 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. 

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

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(i) Cl– ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell. 

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