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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn078

Assertion (A): In every iron atom has an actual oxidation state of . Reason (R): is the mixed oxide with Fe(II) and Fe(III) in the ratio 1:2.

  1. ABoth A and R are true and R is the correct explanation of A
  2. BA is false but R is true
  3. CBoth A and R are true but R is not the correct explanation of A
  4. DA is true but R is false

Answer: B

Charge balance gives an average of ( over 3 Fe), but real iron atoms are Fe(II) or Fe(III), never . So A is false, while R is true.
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