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JEE Advanced 2011Paper 2
Exam
JEE Advanced
Year
2011
Paper
Paper 2
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Advanced 2011 · Paper 2 · Chemistry · General Principles and Processes of Isolation of Metals

Oxidation states of the metal in the minerals haematite and...

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 Fe2O3\mathrm{Fe}_2 \mathrm{O}_3, in which oxidation number of iron is III. Magnetite is Fe3O4\mathrm{Fe}_3 \mathrm{O}_4 which is infact a mixed oxide (FeO ⋅Fe2O3\cdot \mathrm{Fe}_2 \mathrm{O}_3 ) hence, iron is present in both II and III oxidation state.
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