Among the following oxides of 3d elements, the number of mixed oxides are $\_\_\_\_$ .\ $ \mathrm{T

Question

Among the following oxides of 3d elements, the number of mixed oxides are $\_\_\_\_$ .\ $ \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 $

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