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Question

The oxidation states of the metal in the minerals haematite and magnetite respectively are:

A
II, III in haematite and III in magnetite
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B
II, III in haematite and II in magnetite
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C
III in haematite and II, III in magnetite
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D
II in haematite and II, III in magnetite
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Solution

The correct option is C III in haematite and II, III in magnetite
Haematite is (Fe2O3). Let the oxidation state of Fe be x
i.e 2x - 6 = 0
x = 3
Magnetite is (Fe3O4). It is the oxide of Fe which exist as (FeO.Fe2O3).
Hence, Fe exists in both +2 and +3 oxidation state.

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