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Question
JEE Main
Chemistry

Among the following oxides of 3d elements, the number of mixed oxides are _________.
$\text{Ti}_2\text{O}_3, \text{V}_2\text{O}_4, \text{Cr}_2\text{O}_3, \text{Mn}_3\text{O}_4, \text{Fe}_3\text{O}_4, \text{Fe}_2\text{O}_3, \text{Co}_3\text{O}_4$

Oxides Analysis: Identifying Mixed Oxides

A mixed oxide contains a metal in multiple distinct oxidation states. We need to identify these from the given list of 3d element oxides.

3d Elements Oxides Breakdown

  • $\text{Ti}_2\text{O}_3$: Titanium is in a single oxidation state (+3). Not a mixed oxide.
  • $\text{V}_2\text{O}_4$: Vanadium has an average oxidation state of +4. This formula typically represents a single oxidation state, not multiple distinct ones. Not classified as a mixed oxide in this context.
  • $\text{Cr}_2\text{O}_3$: Chromium is in a single oxidation state (+3). Not a mixed oxide.
  • $\text{Mn}_3\text{O}_4$: Contains Mn in both +2 and +3 oxidation states (often written as $\text{MnO} \cdot \text{Mn}_2\text{O}_3$). This is a mixed oxide.
  • $\text{Fe}_3\text{O}_4$: Contains Fe in both +2 and +3 oxidation states (magnetite, often written as $\text{FeO} \cdot \text{Fe}_2\text{O}_3$). This is a mixed oxide.
  • $\text{Fe}_2\text{O}_3$: Iron is in a single oxidation state (+3). Not a mixed oxide.
  • $\text{Co}_3\text{O}_4$: Contains Co in both +2 and +3 oxidation states (often written as $\text{CoO} \cdot \text{Co}_2\text{O}_3$). This is a mixed oxide.

Number of Mixed Oxides Calculation

The mixed oxides identified from the list are:

  • $\text{Mn}_3\text{O}_4$
  • $\text{Fe}_3\text{O}_4$
  • $\text{Co}_3\text{O}_4$

There are 3 mixed oxides in the provided list.

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Important Questions from Inorganic Chemistry

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    B. The complex is white in colour.
    C. The calculated spin-only magnetic moment of the complex is 2.84 BM.
    D. The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is $-0.8 \, \Delta_0$.
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  3. Given below are two statements :
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