1.

In the spinel structure, oxides, ions are cubical-closest packed whereas 1/8th of tetrahedral voids are occupied by A^(2+) cation and 1/2 of octahedral voids are occupied by B^(3+)cations. The general formula of the compound having spinel structure is:

Answer»

`A_2B_2O_4`
`AB_2 O_4`
`A_2B_4O_2`
`A_4B_2O_2`

Solution :No. of `A^(2+) = 1/8 XX 8= 1`
No. of `B^(3+) = 1/2 xx 4 = 2`
No. of `O^(2-) = 8 xx 1/8 + 6 xx 1/2 = 4`
`(AB_2O_4)`


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