Acidified potassium permanganate solution is decolourised by (AFMC 2007)

Potassium permanganate is an oxidizing agent. It is a dark purple colour solid. Acidified potassium permanganate oxidizes the Mohr’s salt (ferrous salt) to the ferric salt. The reaction between acidified potassium permanganate and Mohr’s salt is as follows, 4 4 4 4 2 2 4 2 2 4 4 2 4 3 4 4 2 2 2KMnO +10FeSO NH SO .6H O+8H SO K SO +2MnSO +5Fe (SO ) +10 NH SO +68H O Here manganese reduces from +7 Mn to +2 Mn . It is purple in +7 Mn form and loses its colour in 2 the oxidation state. Therefore, Mohr’s salt decolourises the potassium permanganate solution. Thus, (c) is the correct opti