i think it's (c).....might be wrong....
amount of oxalic acid present in a solution can be determined by its titration with kmno4 soln in d presence of h2so4.the titration give insatisfactory result when carried out in presence of hcl becoz hcl
a)gets oxidised by oxalic acid to chlorine
b)firnishes h+ ions in addition to those from oxalic acid
c)reduces permanaganate to mn2+
d)oxides oxalic acid to carbon di oxide and water
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