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NEET levelSingle correct optionDifficulty 1 of 3ss133

In the fluorite structure of $CaF X_{2}$ , the fluoride ions occupy

Aall the octahedral voids of the $Ca X^{2 +}$ ccp lattice
Bhalf of the tetrahedral voids of the $Ca X^{2 +}$ lattice
Cthe body centre only
Dall the tetrahedral voids of the $Ca X^{2 +}$ ccp lattice

Answer: D

Ca X^{2 +}

ions form an fcc array (

Z = 4

) with 8 tetrahedral voids, all filled by

F X^{-}

, giving

CaF X_{2}

with CN 8 for

Ca X^{2 +}

and 4 for

F X^{-}

.

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