Q. 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 given unsatisfactory result when carried out in the presence of HCl because HCl
A) Gets oxidised by oxalic acid to chlorine
B) Furnishes $H^{+}$ ions in addition to those from oxalic acid
C) reduces permanganate to ${{Mn}^{2}}^{+}$
D) Oxidises oxalic acid to carbon dioxide and water
Explanation
(c)
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 $Mn^{2 +}$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.