# NEET Chemistry The Solid State Questions Solved

A 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 1/8th of the tetrahedral void occupied by one type of metal and one half of the octahedral voids occupied by another type of metal ions. Such a
spinel is formed by $Z{n}^{2+}$, $A{l}^{3+}$ and ${O}^{2-}$ with $Z{n}^{2+}$ in tetrahedral void. Give the simplest formula of the spinel.

(A) $ZnA{l}_{2}{O}_{4}$

(B) $ZnA{l}_{2}{O}_{3}$

(C) ZnAlO

(D) None of these

Concept Videos :-

#5 | Simple Cubic Unit Cell: Coordination Number
#10 | FCC Unit Cell: Coordination Number
#15 | Tetrahedral Voids
#16 | Octahedral Voids
#17 | Position of Tetrahedral Voids in FCC
#18 | Position of Octahedral Voids in FCC
#19 | Hexagonal Primitive (HP) Unit Cell
#22 | Coordination Number of HP Unit Cel
#23 | Radius Ratio

Concept Questions :-

Voids and radius ratio/coordination number
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