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In an oxide Ore half of tetrahedral void...

In an oxide Ore half of tetrahedral voids are occupied by `A^(+x)` ions and half of the octahedral voids are occupied by `B^(+y)` y in the ‘hcp' arrangement of oxide ions. What is `(x+y)`? 

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A spinel is an important class of oxides consising of two types of metal ions with the oxide ions arranged in cop layers. The normal spinel has one-eigth of the tetrahedral holes occupied by one type of metal ion and one-half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by Mg^(2+), A^(2+) and O^(2-) . The neutratrality of the crystal is maintained. Type of hole occupied by Mg^(2+) ions is

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AAKASH SERIES-SOLID STATE-PRACTICE SHEET - 5
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