JEE Main 2026 Jan 22 Shift 2, Chemistry Q23: d-Block Elements

JEE Main2026Jan 22, Shift 2Chemistry

Among the following oxides of 3d elements, the number of mixed oxides are ______ .

$T i_{2} O_{3}, V_{2} O_{4}, C r_{2} O_{3}, M n_{3} O_{4}, F e_{3} O_{4}, F e_{2} O_{3}, C o_{3} O_{4}$

Your answer

Solution

A mixed oxide contains the metal in two different oxidation states. Among the list:

$M n_{3} O_{4} \equiv M n O \cdot M n_{2} O_{3}$ (Mn(II) + Mn(III)) ✓

$F e_{3} O_{4} \equiv F e O \cdot F e_{2} O_{3}$ (Fe(II) + Fe(III)) ✓

$C o_{3} O_{4} \equiv C o O \cdot C o_{2} O_{3}$ (Co(II) + Co(III)) ✓

The remaining oxides ( $T i_{2} O_{3}, V_{2} O_{4}, C r_{2} O_{3}, F e_{2} O_{3}$ ) have a single oxidation state. Number of mixed oxides $= 3$ .

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