Acidified potassium permangate can't oxidize

Answer the following questions : Acidified potassium permanganate (KMnO_4) is a chemical oxidant and explain, how acidified potassium permanganate oxidise ferrous sulphate (FeSO_4) . Accordingly write a new definition of oxidation and reduction.

Acidified potassium permanganate soultion is decoloursied by

Acidified potassium permanganate solution is decolourised by

Give balanced chemical equation for the following reaction: (i) Potassium iodide is treated with acidified potassium permanganate solution. (ii) Sodium dichromate with calculate amount of potassium chloride. (iii) Sulphur dioxide treated with acidified potassium permanganate.