1.

Amount of oxalicacid present in a solution can bedetermined by its titration with KMnO_(4)solution in the presenceof H_(2)SO_(4) . The titration gives unsatisfactory rasult when carried out the presence of HCl because HCl

Answer»

reducs permanganate to `Mn^(2+)`
OXIDISES oxalic acid to carbon dioxide and water
gets oxidized by oxalic acid to chlorine
furnishes `H^(+)` ions in addition to those from oxalic acid.

Solution :In presence of `H_(2)SO_(4), KMnO_(4)` oxidises oxalic acid to `CO_(2)` .In presence of HCl, `KMnO_(4)` not only oxidises oxalic acid but ALSO oxidises HCl to `Cl_(2)` and itself it is reduced to `Mn^(2+)`


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