Question:medium
Among the following oxides of 3d elements, the number of mixed oxides are ____________.
\[
\mathrm{Ti_2O_3,\ V_2O_4,\ Cr_2O_3,\ Mn_3O_4,\ Fe_3O_4,\ Fe_2O_3,\ Co_3O_4}
\]
Among the following oxides of 3d elements, the number of mixed oxides are ____________.
\[ \mathrm{Ti_2O_3,\ V_2O_4,\ Cr_2O_3,\ Mn_3O_4,\ Fe_3O_4,\ Fe_2O_3,\ Co_3O_4} \]
\[ \mathrm{Ti_2O_3,\ V_2O_4,\ Cr_2O_3,\ Mn_3O_4,\ Fe_3O_4,\ Fe_2O_3,\ Co_3O_4} \]
Show Hint
Mixed oxides usually have formulas like \(M_3O_4\) and can be written as a combination of two simpler oxides.
Updated On: Feb 24, 2026
Show Solution
Correct Answer: 3
Solution and Explanation
The task is to identify the mixed oxides from the given list of 3d element oxides. Mixed oxides contain more than one oxidation state of the same metal in a single compound.
To determine this, we will assess the oxidation states in each compound:
To determine this, we will assess the oxidation states in each compound:
- Ti2O3: Titanium has a single oxidation state of +3 here without mixing.
- V2O4: Vanadium has an oxidation state of +4 for both atoms (not a mixed oxide).
- Cr2O3: Chromium is in a +3 oxidation state only.
- Mn3O4: Manganese oxidation states are +2 and +3, indicating a mixed oxide.
- Fe3O4: Known as magnetite, iron is in +2 and +3 oxidation states, making it a mixed oxide.
- Fe2O3: Iron is exclusively in the +3 oxidation state.
- Co3O4: Cobalt exhibits +2 and +3 oxidation states, confirming it as a mixed oxide.
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Top Questions on d -and f -Block Elements
- Statement-I : Consider the following pairs of ions $(\text{Sc}^{3+}, \text{Ti}^{3+}), (\text{Ti}^{4+}, \text{Ni}^{2+}), (\text{Cu}^{2+}, \text{Zn}^{2+})$ and $(\text{Cr}^{3+}, \text{Mn}^{3+})$. Out of these pairs three pairs consist of ions that are both coloured :
Statement-II : Among the lanthanide ions $\text{Eu}^{2+}$, $\text{Gd}^{3+}$, $\text{Ce}^{4+}$ and $\text{Tb}^{4+}$, the ion $\text{Tb}^{4+}$ is the strongest reducing agent.
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