MetallurgyHard
Question
Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
Options
A.II, III in haematite and III in magnetite
B.II, III in haematite and II in magnetite
C.II in haematite and II, III in magnetite
D.III in haematite and II, III in magnetite
Solution
Haematite : Fe2O3 : 2x + 3 × (-2) = 0 ⇒ x = 3
Magnetite : Fe3O4 [an equimolar mixture of FeO and Fe2O3]
FeO : x - 2 = 0 ⇒ x = 2
Fe2O3 : x = 3
Magnetite : Fe3O4 [an equimolar mixture of FeO and Fe2O3]
FeO : x - 2 = 0 ⇒ x = 2
Fe2O3 : x = 3
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