AIIMS 2018 Chemistry Transition Elements MCQ Question

MnO₄⁻, or permanganate ion, is highly stable in acidic medium due to the strong oxidizing properties of manganese in the +7 oxidation state, which prevents it from undergoing reduction and changing color. In acidic conditions, MnO₄⁻ retains its deep purple color, whereas in neutral or basic conditions, it can be reduced to Mn²⁺, which is nearly colorless. Other options are not applicable as they do not provide relevant information or alternatives regarding the stability and color change of MnO₄⁻ in different pH environments. Understanding the stability of MnO₄⁻ in acidic solutions is crucial for predicting its behavior in redox reactions.