Question

In a closed packed structure of mixed oxides, the lattice is composed of mixed oxides ions. One-eighth of tetrahedral voids are occupied by divalent cation `(A^(2+))` while one-half of octahedral voids are occupied by trivalent cations `(B^(3+))`. The fromula of mixed oxide is
A. `ABO_(4)`
B. `AB_(2)O_(4)`
C. `AB_(2)O`
D. `ABO`

Answer 1

Correct Answer - B
For per oxide ion in unit cell:
Number of tetrahedral voids per ion in lattice=2
Number of divalent cation (A)
Number of octahedral voids per ion in lattice=1
Number of trivalent cations(B)
Formula =`A_(1//4)B_(1//2)O=AB_(2)O_(4)`