oxidation states of the metal in the minerals haematite and magnetite, respectively, are
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a
II, III in haematite and III in magnetite
b
II, ilI in haematite and II in magnetite
c
II in haematite and II, tII in magnetite
d
III in haematite and II, III in magnetite
answer is D.
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Detailed Solution
Haematite is Fe2O3, in which oxidation number of iron is III. Magnetite is Fe3O4 which is infact a mixed oxide (FeO. Fe2O3), hence iron is present in both II and III oxidation state.