Question

Potassium permanganate acts as an oxidising agent in acidic medium. The number of moles of potassium permanganate that will be needed to react with one mole of sulphide ions in acidic solution is

Answer 1

${2Mn{O}_4}^{-}+16H^{+}+5S^{2-}⟶2M{n}^{2+}+5S+8H_{2}O$

For 5 moles of S, number of moles of potassium permanganate required = 2
For 1 moles of S, number of moles of potassium permanganate required = 2/5