When KMnO4 solution is added to hot oxalic acid solution, the decolorisation is slow in the beginnin — d and f Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: The redox titration is represented by the equation: 2MnO4^- + 5C2O4^2- + 16H+ -> 2Mn2+ + 10CO2 + 8H2O. Step 2: The reaction starts slowly because there are no manganese(II) ions initially present to facilitate the reaction. Step 3: Once Mn2+ ions are generated as products, they catalyze the ongoing reaction. This phenomenon is known as autocatalysis. Thus, option (a) is correct.