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 $A B_{2}$ (A: cation, B: anion).
STATEMENT-2: There are 6 cations and 12 anions per FCC unit cell of the Fluorite structure.

Statement-1 is True,Statement - 2 is True; Statement-2 is a correct explanation for Statement-1.

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Statement-1 is True,Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1

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Statement-1 is True,Statement-2 is False

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Statement-1 is False,Statement-2 is True

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Solution

The correct option is B Statement-1 is True,Statement-2 is False
Cations occupy $F C C$ lattice in fluorite $(C a F_{2})$ structure and anions occupy all the tetrahedral voids.

No. of cation per unit cell $= 8 \times \frac{1}{8} + 6 \times \frac{1}{2} = 4$
No. of anion per unit cell $= 8$ (No. of Tetrahedral voids)
$= 8$
Statement-1 is True,Statement-2 is False. Option C is correct.

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