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Q.

In a compound XY2O4, oxide ions are arranged in CCP and cations X are present in octahedral voids. Cations Y are equally distributed between octahedral and tetrahedral voids. The fraction of the octahedral voids occupied is

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a

1 /2

b

1 /4

c

1 /8

d

1 /6

answer is A.

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Detailed Solution

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Oxide ions are arranged in CCP, i. e = 4 O-2

Number of octahedral voids = 4

Number of tetrahedral voids = 8

According to Formula XY2O4

Number of  cations X  per unit cell =1 X

Number of cations Y  per unit cell =2 Y

Cations Y are equally distributed between octahedral and tetrahedral voids, that means 1 cation Y is present in  octahedral voids and  1 Y cation present in  tetrahedral void.

The fraction of the octahedral voids occupied is = 1/2

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