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KCET2010ChemistryGeneral Principles and Processes of Isolation of Metals

In chromite ore, the oxidation number of iron, and chromium are respectively

Options

  1. A+3,+2
  2. B+3,+6
  3. C+2,+6
  4. D+2,+3

Correct answer

D. +2,+3

Step-by-step solution

Chromite or chrome iron ore is FeCr ₂ O ₄ . Its actual composition is FeO Cr ₂ O ₃ . In FeO , oxidation state of Fe is calculated as aligned x +(-2) &=0 x &=+2 aligned Similarly, in Cr ₂ O ₃ , the oxidation state of Cr is calculated as aligned 2 x+(-2) 3 &=0 2 x &=+6 x &=+3 aligned

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