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(a) In a crystalline solid having molecular formula A2B anion B are arranged in cubic close packed lattice and cations A are equally distributed between octahedral and tetrahedral voids (i) What percentage of octahedral voids is occupied? (ii) What percentage of tetrahedral voids is occupied?
(a) In a crystalline solid having molecular formula A2B anion B are arranged in cubic close packed lattice and cations A are equally distributed between octahedral and tetrahedral voids
(i) What percentage of octahedral voids is occupied?
(ii) What percentage of tetrahedral voids is occupied?
no. of B ions = 4 [cubic closed packed]
no . of octahedral voids = 4
no. of tetrahedral voids = 8
since the molecular formula is A2B
so no. of A ions = 8
4 in tetrahedral' 4 in octahedral
hence percentage of octahedral void occupied = 100
percentage of tetrahedral void occupied = 50
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