The magnetic oxide of iron is:

Haematite

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Magnetite

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Siderite

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Limonite

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Solution

The correct option is B Magnetite
Hematite ( $F e_{2} O_{3}$ ) is an anti-ferromagnetic material below the Morin transition at 250 K, and a canted anti-ferromagnet or weakly ferromagnetic above the Morin transition.

Magnetite (Fe3O4) is a ferrimagnetic material, which is also easily available and possesses considerable magnetic properties

Rest are non-magnetic at all temperatures.

Option B is correct.

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