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Lattice Energy

why does f- o...

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why does f- occupy the voids in fluorite because according to i tutor the voids are usually occupied by cations

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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.

Q. Assertion :An important feature of Fluorite structure 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). Reason: There are 6 cations and 12 anions per FCC unit cell of the Fluorite structure.

Q. In rock salt structure, what percentage of the octahedral voids are occupied by cations?

Q. In a solid, oxide ions are arranged in hcp. One-third of octahedral voids are occupied by the cations A and one-sixth of the tetrahedral voids are occupied by the cations B. What is the formula of the compound?

Q. In a compound, oxides ions form fcc lattice, whereas

\frac{1}{4} t h

of tetrahedral voids are occupied by cations

A^{2 +}

\frac{1}{8} t h

of octahedral voids are occupied by cations

B^{3 +}

ions. The simplest formula of the compound is

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