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Chemistry · d and f Block Elements

JEE Main 2026 — 22 January, Evening Shift — Question 64

Among the following oxides of 3d elements, the number of mixed oxides are ____\_\_\_\_ . Ti2O3, V2O4,Cr2O3,Mn3O4,Fe3O4,Fe2O3,Co3O4\mathrm{Ti}_{2} \mathrm{O}_{3}, \mathrm{~V}_{2} \mathrm{O}_{4}, \mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{Mn}_{3} \mathrm{O}_{4}, \mathrm{Fe}_{3} \mathrm{O}_{4}, \mathrm{Fe}_{2} \mathrm{O}_{3}, \mathrm{Co}_{3} \mathrm{O}_{4}

Answer: 3

Numerical answer — enter this value.

Step-by-step solution

Mn3O4=MnO⋅Mn2O3Fe3O4=FeO⋅Fe2O3 Sol. Co3O4=CoO⋅Co2O3\begin{array}{ll} & \mathrm{Mn}_{3} \mathrm{O}_{4}=\mathrm{MnO} \cdot \mathrm{Mn}_{2} \mathrm{O}_{3} \\& \mathrm{Fe}_{3} \mathrm{O}_{4}=\mathrm{FeO} \cdot \mathrm{Fe}_{2} \mathrm{O}_{3} \text { Sol. } \\& \mathrm{Co}_{3} \mathrm{O}_{4}=\mathrm{CoO} \cdot \mathrm{Co}_{2} \mathrm{O}_{3}\end{array}  Only   three  mixed   oxides \begin{aligned} & \text { Only\; three } \\& \text { mixed\; oxides }\end{aligned}

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Exam
JEE Main 2026
Paper
22 January, Evening Shift
Subject
Chemistry
Chapter
d and f Block Elements
Topic
Properties of general compounds of transition elements

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