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Question

An amount of oxalic acid present in the solution can be oxidised 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:

A
oxidises oxalic acid to carbon dioxide and water
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B
gets oxidised by oxalic acid to chlorine
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C
furnishes H+ ions in addition to those from oxalic acid
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D
reduces permanganate to Mn2+
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