KMnO4 acts as an oxidising agent in acidic medium.

KMnO4 acts as an oxidising agent in acidic medium. The number of moles of KMnO4 that will be needed to react with one mole of sulphide ions in acidic solution is

(i) 2/5

(ii) 3/5

(iii) 4/5

(iv) 1/5