Oxidation states of the metal in the minerals hematite and magnetite, respectively, are:

II, III in haematite and III in magnetite

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II, III in haematite and II in magnetite

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II in haematite and II, III in magnetite

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III in haematite and II, III in magnetite

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Solution

The correct option is D
III in haematite and II, III in magnetite

Haematite is $F e_{2} O_{3}$ and clearly iron is in its +3 oxidation state.
Magnetite is $F e_{3} O_{4}$ which is in fact $F e O . F e_{2} O_{3}$ .
$F e O$ is Iron (II) oxide while $F e_{2} O_{3}$ is Iron (III) oxide.

Hence, magnetite has iron in both III and II

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