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JEE Main20264 April 2026Morning ShiftChemistryRedox ReactionsActual

In order to oxidise a mixture of 1 mole each of FeC₂O₄ , Fe₂(C₂O₄)₃ , FeSO₄ and Fe₂(SO₄)₃ in acidic medium, the number of moles of KMnO₄ required is

Options

  1. A3
  2. B2
  3. C5
  4. D7

Correct answer

B. 2

Step-by-step solution

In acidic medium, KMnO₄ acts as an oxidising agent and gets reduced to Mn²⁺ . The n-factor for KMnO₄ is 5 . The n-factors for the given reducing agents are calculated based on the total number of moles of electrons lost per mole of the compound: For FeC₂O₄ : Fe²⁺ Fe³⁺ + e⁻ C₂O₄²⁻ 2CO₂ + 2e⁻ Total electrons lost = 3 , so n-factor = 3 . Equivalents = 1 3 = 3 . For Fe₂(C₂O₄)₃ : Fe³⁺ is not oxidised. 3C₂O₄²⁻ 6CO₂ + 6e⁻ Total electrons lost = 6 , so n-factor = 6 . Equivalents = 1 6 = 6 . For FeSO₄ : Fe²⁺ Fe³⁺ + e⁻ SO₄²⁻

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