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Which of the following statements is not...

Which of the following statements is not correct?

A

In an antiflourite structure anions form fcc and cations occupy all the tetrahedral voids.

B

CsCl structures is `8:8` type structure.

C

In Rock salt structures both cations and anions are present in octahedral voids formed by oppositely charged ions.

D

Density of the crystal always increases due to substitution defect.

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