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JEE Advanced2011ChemistryGeneral Principles and Processes of Isolation of MetalsActual

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

Options

  1. AII, III in haematite and III in magnetite
  2. BII, III in haematite and II in magnetite
  3. CII in haematite and II, III in magnetite
  4. DIII in haematite and II, III in magnetite

Correct answer

D. III in haematite and II, III in magnetite

Step-by-step 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 (FeO Fe ₂ O ₃ ) hence, iron is present in both II and III oxidation state.

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