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JEE Main2008Chemistryd and f Block ElementsActual

Amount of oxalic acid present in a solution can be determined by its titration with KMnO ₄ solution in the presence of H ₂ SO ₄ . The titration gives unsatisfactory result when carried out in the presence of HCl , because HCl

Options

  1. Agets oxidised by oxalic acid to chlorine
  2. Bfurnishes H ⁺ ions in addition to those from oxalic acid
  3. Creduces permanganate to Mn ²⁺
  4. Doxidises oxalic acid to carbon dioxide and water

Correct answer

C. reduces permanganate to Mn ²⁺

Step-by-step solution

HCl being stronger reducing agent reduces MnO ₄⁻ to Mn ²⁺ and result of the titration becomes unsatisfactory.

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