1.

In the calcum fluaride structure, the coordination bumber of the cations and anions are respectively ,A. 6,6B. 8,4C. 4,4D. 4,8

Answer» Correct Answer - B
The `Ca^(2+)` ions are arranged in (ccp) arrangement i.e. `Ca^(2+)` ions are present at all corners and tat the centre of each face of the cube, the fluoride ions occupy all the tetrahedral sites. This is 8:4 arrangement i.e., each `Ca^(2+)` ion is surrounded by `8F^(-)` ions and each `F^(-)` ion by four `Ca^(2+)` ions.


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