Chemistry - Redox Reactions Question with Solution | TestHub

Option (A): PbO₂ in conc. HNO₃ is a standard laboratory test (the "Lead Dioxide Test") where manganese is oxidized to the characteristic purple permanganate ion.

Option (B): NaBiO₃ (Sodium bismuthate) in acid is an exceptionally strong oxidant specifically used for this qualitative identification.

Option (C): (NH₄)₂S₂O₈ (Ammonium persulphate) in the presence of H⁺ (and often Ag⁺ catalyst) is strong enough to perform this oxidation.

Option (D): Potassium iodate in a basic medium is not typically used for this specific conversion, as the $+7$ state is most stable/formed under the conditions provided in A, B, and C.