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Q.

Identify the correct statements

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a

Frenkel defect appears in AgI, ZnS and AgBr.

b

Zinc blend structure is obtained when Zn+2 occupies half tetrahedral sites

c

Ferrimagnetism is in the alignment of magnetic moments 

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but not in 

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d

In antifluorite structure cations are arranged in CCP while anions occupy all the tetrahedral voids.

answer is A.

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Detailed Solution

1.Frenkel defect appears in AgI, ZnS and AgBr.

2.Zinc blend structure is obtained when Zn+2 occupies half tetrahedral sites

3.Ferrimagnetism is in the alignment of magnetic moments 

Question Image

but not in 

Question Image

4.In antifluorite structure, anions form CCP structure while the tetrahedral sites are occupied by the cations. Each cation at tetrahedral void is surrounded by 4 oxide anions and the oxide anions are surrounded by 8 cations, each. Hence, the coordination number of cation is 4 and coordination number of anion is 8.

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