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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
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Oxidation states of the metal in the minerals haematite and magnetite,...
Oxidation States in Haematite and Magnetite

Haematite:
- Haematite, also known as iron(III) oxide, has the chemical formula Fe2O3.
- In haematite, the oxidation state of iron (Fe) is +3.
- This is because oxygen (O) is assigned an oxidation state of -2, and since there are three oxygen atoms in Fe2O3, the total oxidation state of oxygen is -6.
- The sum of the oxidation states in a compound is equal to the overall charge of the compound, which in this case is 0 since haematite is neutral.
- Therefore, the oxidation state of iron can be calculated using the equation: 2x + (-6) = 0, where x is the oxidation state of iron.
- Solving this equation, we find that the oxidation state of iron in haematite is +3.

Magnetite:
- Magnetite has the chemical formula Fe3O4.
- In magnetite, there are two different oxidation states of iron present: +2 and +3.
- The Fe2+ ions have an oxidation state of +2, while the Fe3+ ions have an oxidation state of +3.
- The oxygen atoms in magnetite are still assigned an oxidation state of -2.
- To determine the ratio of Fe2+ to Fe3+ in magnetite, we can set up an equation based on the overall charge of the compound, which in this case is 0: 2x + 3y + (-8) = 0, where x is the number of Fe2+ ions and y is the number of Fe3+ ions.
- Solving this equation, we find that the ratio of Fe2+ to Fe3+ in magnetite is 1:2.
- Therefore, the oxidation states of iron in magnetite are +2 and +3.

Conclusion:
- The oxidation state of iron in haematite is +3, while in magnetite it is +2 and +3.
- Therefore, the correct answer is option 'D': III in haematite and II, III in magnetite.
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Oxidation states of the metal in the minerals haematite and magnetite, respectively, area)II, III in haematite and III in magnetiteb)II, III in haematite and II in magnetitec)II in haematite and II, III in magnetited)III in haematite and II, III in magnetiteCorrect answer is option 'D'. Can you explain this answer?
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