MDCAT Chemistry MCQ #5108

During the titration of KMnO4 with oxalic acid, the purple color disappears slowly at first but rapidly later. What explains this?

MDCAT Chemistry MCQ #5108

  1. Question 1

    Q1. During the titration of KMnO4 with oxalic acid, the purple color disappears slowly at first but rapidly later. What explains this?

    • A) KMnO4 acts as the catalyst
    • B) Oxalic acid acts as the catalyst
    • C) The reaction is inhibited by acidic conditions
    • D) Mn2+ ions act as an autocatalyst

    Answer: Mn2+ ions act as an autocatalyst

    Explanation: Mn2+ acts as an autocatalyst, speeding up the reaction as it proceeds. Option A is wrong because KMnO4 is the reactant.