Question

The amount of H2S that can be oxidisd to sulfur on oxidation using 1.58 gm of KMnO4 as oxidising agent in acidic medium will be

Answer 1

Reducing nature of SO2:

2KMnO4+5SO2+2H2O⟶K2SO4+2MnSO4+2H2SO4

Acidic nature of SO2:

SO2+2H2O2H+O2KMnO4+3H2SO4⟶H2SO4+2H⟶H2O⟶K2SO4+2MnSO4+3H2O+5[O]

Also, it is said that H2SO4 is a moderately strong oxidizing agent. How can H2SO4 reduce KMnO4 to MnSO4 .