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Standard XII

Chemistry

Voids

Spinel is a i...

Question

Spinel is a important class of oxides consisting of two types of metal ions with the oxide ions arranged in CCP pattern. The normal spinel has one eight 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 $Z n^{2 +}, A l^{3 +}, O^{2 -}$ with $Z n^{2 +}$ in the tetrahedral holes. Give the formula of spinel :

Z n A l_{2} O_{4}

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Z n_{2} A l O_{4}

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Z n_{2} A l_{2} O_{4}

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None of the above

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Solution

The correct option is A $Z n A l_{2} O_{4}$
The formula of spinel is $Z n A l_{2} O_{4}$
The general formula of spinels is $A B_{2} O_{4}$ or $A [B_{2}] O_{4}$ where square bracket represents the cations occupying octahedral sites.
The spinel structure consists of an fcc array of oxide ions in which the A cations occupy one-eighth of the tetrahedral holes and the B cations occupy the octahedral holes.
In inverse spinels, the cation distribution is $B [A B] O_{4}$

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Similar questions

Spinel is an important class of oxides consisting of two types of metal ions with the oxide ions arranged in ccp layers. The normal spinel has one-eighth 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

M g^{2 +}

A l^{3 +}

and

O^{2 -}

. The neutrality of the crystal is being maintained.

The type of holes occupied by

M g^{2 +}

ions is___________.

Q. Spinel is an important class of oxides consisting of two types of metal ions with the oxide ions arranged in CCP pattern. The normal spinel has 1/8 of the tetrahedral holes occupied by one type of metal ion and 1/2 of the octahedral holes occupied by another type of metal ion. Such a spine is formed by

Z n^{2 +}, A l^{3 +}

and

O^{2 -}

with

Z n^{2 +}

in the tetrahedral holes. If CCP arrangement of oxide ions remains undistorted in the presence of all the cations, formula of spinel and percentage of the packing fraction of crystal are respectively:

M g^{2 +}

A l^{3 +}

and

O^{2 -}

. The neutrality of the crystal is being maintained.

If oxide ion is replaced by

X^{- 8 / 3}

, the number of anionic vacancies per unit cell is :

In a normal spinel type structure, the oxide ions are arranged in ccp whereas $\frac{1}{8}$ tetrahedral holes are occupied by $Z n^{2 +}$ ions and 50% of octahedral holes are occupied by $F e^{3 +}$ ions. The formula of the compound is ?

Q. In a normal spinel types structure, the oxide ions are arranged in ccp whereas 1/8 tetrahedral holes are occupied by

Z n^{2 +}

ions and 50% of octahedral holes are occupied by

F e^{3 +}

ions. The formula of the compound is –

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