Explain why does colour of `KMnO_(4)` disappear when oxalic acid is added to its solution in acidic medium?

Options

A. the pH of the solution changes on adding oxalic acid, hence `KMnO_4` is decolourised
B. `KMnO_4` oxidises oxalic acid to `CO_2` and itself changes to `Mn^(2+)` ions which are colourless
C. `KMnO_2` is oxidised to potassium sulphate which is colourless
D. on exposure ot air the acidic solution of `KMnO_4` becomes colourless.

Answer

B

Explanation

`5C_2O_4^(2-)+underset(("coloured"))(2MnO_4^(-))+16H^(+)tounderset(("colourless"))(2Mn^(2+))+8H_2O+10CO_2`