A) \[C{{a}^{++}}\] ions are ccp and \[{{F}^{-}}\] ions are present in all the tetrahedral voids
B) \[C{{a}^{++}}\] ions are ccp and \[{{F}^{-}}\] ions are present in all the octahedral voids
C) \[C{{a}^{++}}\] ions are ccp and \[{{F}^{-}}\] ions are present in all the octahedral voids and half of ions are in the tetrahedral voids
D) None
Correct Answer: A
Solution :
\[C{{a}^{2+}}\] ions are ccp and \[{{F}^{-}}\] ions are present in the tetrahedral voids. So, the no. of \[C{{a}^{2+}}\] ions is 4 and no. \[{{F}^{-}}\] ions is 8. So, the formula of the calcium fluoride \[C{{a}_{4}}{{F}_{8}}\] or the simplest formula of calcium fluoride is \[Ca{{F}_{2}}\].
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