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In a crystalline solid, anion B are arra...

In a crystalline solid, anion B are arranged in cubic close packing and cation A are equally distributed between octahedral and tetrahedral voids. If all the octahedral voids are occupied , the formula for the solid is

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Anions y in ccp arrangement = 4
Number of Octahedral voids = 4
Number of Tetrahedral voids = 4
Cations x in Octahedral voids = 4
Cations x in Tetrahedral voids = 4
`therefore` Total cations x in tetrahedral void and octahedral void = 8
`therefore x : y`
8 : 4
Hence, formula is `x_(2)y`
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