A. SO2 oxidizes KMnO4
B. SO2 Reduces KMnO4
C. KMnO4 is inert in acidic medium
D. SO2 can’t undergo redox reaction
Correct Answer: B. SO2 Reduces KMnO4
Detail about MCQs
In the redox reaction of SO2 with KMnO4 in acidic medium, the correct answer is: SO2 Reduces KMnO4
In this reaction, SO2 acts as a reducing agent, causing the reduction of KMnO4 (manganese in KMnO4 undergoes a change in oxidation state from +7 to +2) while itself getting oxidized to sulfuric acid (H2SO4). This is a classic example of a redox reaction, where one substance is oxidized (SO2) while the other is reduced (KMnO4).