Q1 / 60 · JEE Advanced 2011 (Paper 2) · Chemistry

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
  • Correct answer
    D
    III in haematite and II, III in magnetite

Solution

Haematite is $\mathrm{Fe}_2 \mathrm{O}_3$, in which oxidation number of iron is III. Magnetite is $\mathrm{Fe}_3 \mathrm{O}_4$ which is infact a mixed oxide (FeO $\cdot \mathrm{Fe}_2 \mathrm{O}_3$ ) hence, iron is present in both II and III oxidation state.

Hence, the correct answer is option: 'D'.

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