In a crystalline solid with the formula AB_2O | vedclass

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(A) In a $CCP$ lattice of $N$ oxide ions $(O^{2-})$,the number of octahedral voids is $N$ and the number of tetrahedral voids is $2N$.Given the formul

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$12.5 \%$ and $50 \%$

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(A) In a $CCP$ lattice of $N$ oxide ions $(O^{2-})$,the number of octahedral voids is $N$ and the number of tetrahedral voids is $2N$.Given the formula $AB_2O_4$,for $4$ oxide ions,there is $1$ $A$ ion and $2$ $B$ ions.Number of tetrahedral voids = $2 	imes 4 = 8$.Number of octahedral voids = $4$.Percentage of tetrahedral voids occupied by $A = (1 / 8) 	imes 100 = 12.5 \%$.Percentage of octahedral voids occupied by $B = (2 / 4) 	imes 100 = 50 \%$.

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