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a
Face centred cubic
b
Body centred cubic
c
Simple cubic
d
Hexagonal closed packing
answer is A.
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Detailed Solution
Space lattice of CaF2 is face centred cubic. The structure of CaF2 is called fluorite structure.It follows 8 : 4 type arrangement. Co.No. of Ca+2= 8,Ca+2 follows fcc arrangement Co.No. of F-= 4, F- ions present in T.H.V'S