Q.

In the calcium fluoride structure the coordination number of the cation 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

The Ca2+ ions are arranged in (ccp) arrangement, i.e. Ca2+ ions are present at all corners and at the centre of each face of the cube. The fluoride ions occupy all the tetrahedral sites. This is 8 : 4 arrangement, i.e., each Ca2+ ion is surrounded by 8F- ions and each F- ion by four Ca2+ions
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