Question

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are

• 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

Answer 1

Answer: (D)

III in haematite and II, III in magnetite

Answer 2

Haematite is $Fe_2O_3$, in which oxidation number of iron is III. Magnetite is $Fe_3O_4$ which is infact a mixed oxide $(FeO . Fe_2O_3)$, hence iron is present in both II and III oxidation state.