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Q.
$Fe _{3} O _{4}$ (magnetite) is an example of:
The Solid State
Solution:
$Fe _{3} O _{4}$ is an example of inverse spinel. In $Fe _{3} O _{4}$, oxide ions constitute fcc lattice and dipositive ions are present in octahedral holes and tripositive ions are equally distributed between tetrachedral and octahedral holes. A unit cell of $Fe _{3} O _{4}$ contain $4 O ^{2-}, 2 Fe ^{3+}$ and $1 Fe ^{2+}$
ions.