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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 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.
The fromule of the spinel is :

A

`mg_(2)AlO_(2)`

B

`MgAl_(2)O_(4)`

C

`Mg_(3)Al_(3)O_(6)`

D

none of the above

Text Solution

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The correct Answer is:
B
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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:

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 Mg^(2+) ions is:

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. If oxide ion is replaced by X^(-8//3) , the number of anionic vacancy per unit cells is :

In solid, oxide ions are arranged in ccp. One sixth of the tetrahedral voids are occupied by the cations (A) while one third of the octahedral voids, are occupied by the cations (B). What is the formula of the compound ?

In a close-packed structure of oxides, one-eighth of the tetrahedral holes is occupied by bivalent cations (A) and half of the octahedral hole are occupied by trivalent cations (B) , calculate the molecular formula of the oxide.

NARAYNA-SOLID STATE-LEVEL-V
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