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Question

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
(IIT-JEE, 2011)

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
II in haematite and II, III in magnetite
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D
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: Fe2O3 Oxidation state of Fe = III
Magnetite: Fe3O4FeO.Fe2O3
Oxidation state of Fe = II, III

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