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# In the mineral ‘Spinel’ having the formula 2 4, MgAl O oxide ions are in ccp arrangement, (a) What percentage of tetrahedral void is occupied by 2 Mg + ions? (b) What percentage of octahedral void is occupied by 3 Al + ions ?

Grade:upto college level

## 2 Answers

Avinash
askIITians Faculty 1246 Points
5 years ago
According to the formula, MgAl2O4. If there are 4 oxide ions, there will be 1 Mg2+ions and 2 Al3+. But if the 4 O2–ions are ccp in arrangement, there will be 4 octahedral and 8 tetrahedral voids.
(i) Percentage of tetrahedral voids occupied by Mg2+= (1 / 8) × 100
= 12.5%
(ii) Percentage of octahedral voids occupied by Al3+= (2 / 4) × 100
= 50%
Risheesh jain
15 Points
2 years ago
In MgAl2o4. There are 4 o2 ,2al,1mg
Let number of oxide ions be x=4
Octahedral voids=4,, tetrahedral voids=8
Mg=1/8*100=12.5%,,,Al=2/4*100=50%✓✓✓
Hope it helps

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