The colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium. This can be explained as

Question

The colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium. This can be explained as (A) the pH of the solution changes on adding oxalic acid, hence KMnO4 is decolourised (B) KMnO4 oxidises oxalic acid to CO2 and itself changes to Mn2+ ions which are colourless (C) KMnO4 is oxidised to potassium sulphate which is colourless (D) on exposure to air the acidic solution of KMnO4 becomes colourless.

Tardigrade Admin · Accepted Answer

5 C 2 O 42-+ underset text (coloured) 2 MnO 4-+16 H + longrightarrow underset text (colourless) 2 Mn 2++8 H 2 O +10 CO 2

Q. The colour of $K M n O_{4}$ disappears when oxalic acid is added to its solution in acidic medium. This can be explained as

the $p H$ of the solution changes on adding oxalic acid, hence $K M n O_{4}$ is decolourised

$K M n O_{4}$ oxidises oxalic acid to $C O_{2}$ and itself changes to $M n^{2 +}$ ions which are colourless

$K M n O_{4}$ is oxidised to potassium sulphate which is colourless

on exposure to air the acidic solution of $K M n O_{4}$ becomes colourless.

$5 C_{2} O_{4}^{2 -} + (coloured) 2 M n O_{4}^{-} + 16 H^{+} ⟶ (colourless) 2 M n^{2 +} + 8 H_{2} O + 10 C O_{2}$

Q. The colour of KMnO4​ disappears when oxalic acid is added to its solution in acidic medium. This can be explained as

the pH of the solution changes on adding oxalic acid, hence KMnO4​ is decolourised

KMnO4​ oxidises oxalic acid to CO2​ and itself changes to Mn2+ ions which are colourless

KMnO4​ is oxidised to potassium sulphate which is colourless

on exposure to air the acidic solution of KMnO4​ becomes colourless.