Amount of oxalic acid present in a solution can be determined by its titration with $KMn{O_4}$ solution in the presence of ${H_2}S{O_4}.$ The titration gives unsatisfactory result when carried out in the presence of $HCl,$ because $HCl$ :

Question

gets oxidised by oxalic acid to chlorine

furnishes ${H^ + }$ ions in addition to those from oxalic acid

reduces permanganate to $M{n^{2 + }}$

oxaidises oxalic acid to carbon doxide and water

Solution

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