Chemistry - Redox Reactions Question with Solution | TestHub

Acidified KMnO₄ is decolourized by reducing agents. SO₂ (S +4 $\to$ +6), H₂O₂ (O -1 $\to$ 0) and FeSO₄ (Fe²⁺ $\to$ Fe³⁺) all reduce MnO₄⁻ and decolourize it. In FeCl₃, iron is already Fe³⁺ and Cl⁻ is not attacked by dilute acidified MnO₄⁻ at ordinary conditions, so it does not decolourize the solution.