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A spinel is an important class of oxid...

A spinel is an important class of oxide consisting two types of metal ions with the oxide ions arranged in ccp layers . The normal spinel has one -eight of the tetrahedral holes occupied by one type of metal ions and one- half of the octahedral holes occupied by another type of metal ion. Such a spinel is formed by `Mg^(2+), Al^(3+) and O^(2-)` . The neutrality of the crystal is being maintained.
The formula of the spinel is :

A

tetrahedral

B

octahedral

C

both (a) amd(b)

D

None of these

Text Solution

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The correct Answer is:
A
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A spinel is an important class of oxide consisting two types of metal ions withs the oxide ions arranged in ccp layers . The normal spinel has one -eight of the tetrahendral holes occupied by one type of metal ions and one- half of the octaherdral holes occupied by another type of metal ion. Such a spine is formed by Mg^(2+), Al^(3+) and O^(2-) . The netutrality of the crystal is benig maintained. Type of hole occupied by Al^(3+) ions is:

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In a normal spinel structure O^(2-) ions form fcc packing and 1/8 of the tetrahedral sites are occupied by divalent metal, A^(2+) ions and half of the octahedral sites are occupied by trivalent metal B^(3+) ions, what is the ratio of the tetrahedral/octahedral sites: occupied in spinel structure.

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In a solid, oxide ions are arrnged in ccp, cations A occupy A occupy (1/8)^th of the tetrahedral voids and cation B occupy (1/4)^(th) of the octahedral voids. The formula of the compound is: