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In a crystallizes solid, anions B are ar...

In a crystallizes solid, anions `B` are arranged in cubic close packing, cations `A` are equally distributed between octahedral and tetrahedral voids, what is the formula of the solid?

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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_2y`
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