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 hole occupied by another type of metal ion. Such a spinel is formed by Zn^(2+), Al^(3+)andO^(2–), with Zn^(2+) in the tetrahedral holes. Give the formulae of spinel.

Spinel is a important class of oxides consisting of two types of metal

1.	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 hole occupied by another type of metal ion. Such a spinel is formed by Zn^(2+), Al^(3+)andO^(2–), with Zn^(2+) in the tetrahedral holes. Give the formulae of spinel.
Answer» Solution :`ZN^(2+)=8//8=1` `Al^(3+)=4//2=2` `O^(2-)`=CCP(4) `ZnAl_(2)O_(4)` `Zu^(2+)=(1)/(8)xx8` octahedral voids `O^(2)`=CCParrangment(1+3)=4