Question
Among the following oxides of 3 d elements, the number of mixed oxides are \_\_\_\_。 Ti _ 2 O _ 3 , ~V _ 2 O _ 4 , Cr _ 2 O _ 3 , Mn _ 3 O _ 4 , Fe _ 3 O _ 4 , Fe _ 2 O _ 3 , Co _ 3 O _ 4
JEE Main
Chemistry
d and f Block Elements
2026
JEE Main 2026 (22 January Shift 2)
JEE Main Chemistry Question (2026) — Solution
Options
- A. A
- B. B
- C. C
- D. D
Answer
A. A
Step-by-step solution
Mixed oxides contain the same element in two different oxidation states. Analyzing each oxide: Ti₂O₃ contains Ti(+3) only - simple oxide. V₂O₄ contains V(+4) only - simple oxide. Cr₂O₃ contains Cr(+3) only - simple oxide. Mn₃O₄ can be written as MnO·Mn₂O₃, containing both Mn(+2) and Mn(+3) - mixed oxide. Fe₃O₄ can be written as FeO·Fe₂O₃, containing both Fe(+2) and Fe(+3) - mixed oxide. Fe₂O₃ contains Fe(+3) only - simple oxide. Co₃O₄ can be written as CoO·Co₂O₃, containing both Co(+2) and Co(+3) - mixed oxide. Therefore, three mixed oxides are present: Mn₃O₄, Fe₃O₄, and Co₃O₄.
Related: Chemistry — d and f Block Elements · All PYQ Banks