Paper: CSIR-NET June 2019 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Medium
$\mathrm{FeCr}_{2} \mathrm{O}_{4}$ and $\mathrm{NiGa}_{2} \mathrm{O}_{4}$ have normal and inverse spinel structures, respectively. The correct statement is
(a)Fe(II) and Ni(II) occupy octahedral sites
(b)Fe (II) and Ni(II) occupy tetrahedral and octahedral sites, respectively
(c)Cr(III) and Ga(III) occupy only octahedral sites
(d)Cr(III) and Ga(III) occupy tetrahedral and octahedral sites, respectively
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
Normal FeCr₂O₄: Fe(II) tetrahedral; inverse NiGa₂O₄: Ni(II) octahedral (b).