Provide examples of reactions involving acidified permanganate solution as an oxidizing agent, and what transformations occur in substances such as oxalates, iron(II), nitrites, and iodides?

Acidified permanganate solution (MnO₄⁻/H⁺) is a potent oxidizing agent in various reactions. With oxalates, it undergoes a redox reaction, producing carbon dioxide and manganese(II) ions. In the presence of iron(II), it oxidizes to form iron(III) ions. Nitrites are oxidized to nitrogen oxides, and iodides are oxidized to iodine. These reactions showcase the versatility of permanganate in accepting electrons and undergoing reduction while oxidizing other substances. The vibrant color change from purple (permanganate) to colorless or brown indicates the reduction of manganese(VII) to manganese(II) ions during the redox transformations.