Question

why Fe3O4 is called magnetic oxide​

Answer 1

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Because Iron (II,III) oxide (Fe3O4). Ferrosoferric oxide is a black ore of IRON that forms opaque crystals and exerts strong magnetism.

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Answer 2

Answer:

Iron(II,III) oxide is the chemical compound with formula Fe3O4. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (Fe2O3) also known as hematite. It contains both Fe2+ and Fe3+ ions and is sometimes formulated as FeO ∙ Fe2O3