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Q.

In the calcium fluoride structure, the coordination number of the cations and anions are respectively

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a

6, 6

b

4, 4

c

8, 4

d

4, 8

answer is C.

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Detailed Solution

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The ${Ca}^{2 +}$ and $F^{-}$ are located in ${CaF}_{2}$ crystal respectively at face-centred cubic lattice points and in tetrahedral voids.
The calcium fluoride structure is also called fluorite structure.
It is 8:4 arrangement, the coordination number of ${Ca}^{2 +}$ and $F^{-}$ ions is 8 and 4 ions respectively.

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