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 corners and at the centre of each face of the cube. The fluoride ions occupy all the tetrahedral sites. In the\[C{{a}^{2+}}\]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 co-ordination numbers of\[C{{a}^{2+}}\]and \[{{F}^{-}}\]ions are 8 : 4.
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