Q11 of 70 Page 105

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

The following reaction takes place when KMnO4 reacts with sulphide ions in acidic medium. 2 moles of KMnO4 reacts with 5 moles of sulphide ions, so 2/5 moles of KMnO4 reacts with 1 mole of sulphide ions.


5S2– + 2MnO-4 + 16H+→ 2Mn2+ + 8H2O + 5S

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