Statement 1: An important feature of fluorite structures is that cations being large in size occupy FCC lattice points, whereas anions occupy all the tetrahedral voids giving the formula unit: AB2 (A: cation, B: anion).Statement 2: There are 6 cations and 12 anions per FCC unit cell of the fluorite structure.
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a
Both Statement 1 and Statement 2 are true.
b
Both Statement 1 and Statement 2 are false.
c
Statement 1 is true but Statement 2 is false.
d
Statement 1 is false but Statement 2 is true.
answer is C.
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Detailed Solution
In FCC lattice there are 4 cations per unit cell and 8 anions for fluorite structure. It follows 8 : 4 type arrangement. Co.No. of Ca+2= 8 ; Ca+2 follows F.C.C arrangement Co.No. of Cl- = 4 ; F- ions present in tetrahedral voids