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
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a
gets oxidized by oxalic acid to chlorine
b
Furnishes H+ ions in addition to those from oxalic acid
c
Reduces permanganate to Mn2+
d
Oxidises oxalic acid to carbon dioxide and water
answer is C.
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Detailed Solution
Titration of oxalic acid by KMnO4 in the presence of HCl gives unsatisfactory result because HCl is a better reducing agent than oxalic acid and HCl reduces preferably MnO4− to Mn2+.