Which of the following reactions belong strictly to the category of disproportionation? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Disproportionation requires the same element to be oxidized and reduced. Phosphorus (0 to -3 and +1), Sulphur (0 to -2 and +2), and Chlorine (0 to -1 and +1) all undergo this in alkali. Fluorine ($F_2$) is the most electronegative element and only undergoes reduction (0 to -1); oxygen oxidizes instead.