The structure obtained when all the tetrahedral voids are occupied at a FCC structure is of the type:

N a C l

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C s C l

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C a F_{2}

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Z n S

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Solution

The correct option is C $C a F_{2}$
The fluorite structure, in calcium fluoride, has the calcium ions in a face-centred cubic array with the fluoride ions in all (8) of the tetrahedral holes. The fluoride ions have a coordination number of 4, and the calcium ions have a coordination number of 8.

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

(a) $C l^{-}$ ions form fcc lattice and $N a^{+}$ ions occupy all octahedral voids of the unit cell

(b) $C a^{2 +}$ ions form fcc lattice and $F^{-}$ ions occupy all the eight tetrahedral voids of the unit cell

(d) $S^{2 -}$ ions form fcc lattice and $Z n^{2 +}$ ions go into alternate tetrahedral voids of the unit cell

A B_{2}

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