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Organic Chemistry – Some Basic Principles and Techniques

Organic Chemistry – Some Basic Principles and Techniques

Question
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Amount of oxalic acid present in a solution can be determined by its titration with KMnO4 solution in the presence of H2SO4. The titration gives unsatisfactory result when carried out in the presence of HCl, because HCl

  • gets oxidised by oxalic acid to chlorine

  • furnishes H+ions in addition to those from oxalic acid

  • reduces permanganate to Mn2+

  • oxidises oxalic acid to carbon dioxide and water 

Answer

C.

reduces permanganate to Mn2+

HCl being stronger reducing agent reduces MnO4− to Mn2+ and result of the titration becomes unsatisfactory.

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