Extraction of Metals - Result Question 24
####24. Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
(2011)
(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
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Solution:
- Haematite is $Fe _2 O _3$, in which oxidation number of iron is III. Magnetite is $Fe _3 O _4$ which is infact a mixed oxide $\left(FeO \cdot Fe _2 O _3\right)$, hence iron is present in both II and III oxidation state.
