A) 6, 6
B) 8, 4
C) 4, 4
D) 4, 8
Correct Answer: B
Solution :
In \[Ca{{F}_{2}},\] the \[C{{a}^{2+}}\] ions are arranged in ccp arrangement, i.e., \[C{{a}^{2+}}\]ions are present at all the comers and at the centre of each face of the cube. The fluoride ions occupy all the tetrahedral sites. In the \[Ca{{F}_{2}}\]structure, each \[{{F}^{-}}\]ion is surrounded by four \[C{{a}^{2+}}\]ions while each \[C{{a}^{2+}}\]ion is surrounded by eight \[{{F}^{-}}\]ions. Hence, the coordination numbers of \[C{{a}^{2+}}\] and \[{{F}^{-}}\] ions are 8 : 4.
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