Q44Short answer
Explain why does colour of KMnO4 disappear when oxalic acid is added to its solution in acidic medium.
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KMnO4 acts as oxidising agent. It oxidises oxalic acid to CO2 and itself changes to Mn2+ ion which is colourless. 2– – + 5C2O4 + 2MnO4 + 16H → 2Mn2+ + 8H2O + 10CO2 (Coloured) (Colourless) 2– OH– 2–