Amount of oxalic acid present in a solution can be determined by its titration with `KMnO_(4)` solution in the presence of `H_(2)SO_(4)`. The titration gives unsatisfactory result when carried out in the presence of HCl because HCl:

Options

A. (a) Gets oxidized by oxalic acid to chlorine
B. (b) Furnishes `H^(+)` ions in addition to those from oxalic acid
C. (c ) Reduces permanganate to `Mn^(2+)`
D. (d) Oxidises oxalic acid to carbon dioxide and water

Answer

C

Explanation

Titration of oxalic acid by `KMnO_(4)` in the presence of `HCl` gives unsatisfactory result because HCl is a better reducing agent than oxalic acid and `HCl` reduces preferably `MnO_(4)^(-) to Mn^(2+)`