Question

Which color is shown by the permanganate ion?

Answer 1

Potassium permanganate

• Potassium permanganate is prepared by fusion of ${\mathrm{MnO}}_2$ with an alkali metal hydroxide and an oxidizing agent like${\mathrm{KNO}}_3$.
• This produces the dark green ${\mathrm{K}}_2{\mathrm{MnO}}_4$ which disproportionate in a neutral or acidic solution to give permanganate.

Color of permanganate ion

• Potassium permanganate forms dark purple (almost black) crystals.

So, the color shown by the permanganate ion is purple.