This is an acid-base reaction (neutralization): Na2SO3 is a base, H2SO4 is an acid.
This is an oxidation-reduction (redox) reaction:
2MnVII+10e-→2MnII(reduction)
5SIV-10e-→5SVI(oxidation)
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KMnO4 is an oxidizing agent, Na2SO3 is a reducing agent.
Reactants:
KMnO4 – Potassium manganate(VII)
Other names: Potassium permanganate, Chameleon mineral, Condy's crystals
Appearance: Purplish-bronze-gray needles | magenta–rose in solution ; Dark purple crystals
Na2SO3 – Sodium sulfite
Other names: Sodium sulphite, Hypo clear (photography), E221
Appearance: White solid ; White crystals or powder
H2SO4 – Sulfuric acid
Other names: Oil of vitriol, Sulfuric acid, concentrated (> 51% and , H2SO4
Appearance: Clear, colorless liquid ; Odourless colourless oily hygroscopic liquid ; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.]
Products:
MnSO4 – Manganese(II) sulfate
Other names: MnSO4, Manganese sulfate anhydrous, Manganese sulphate
Appearance: White crystals (anhydrous) | pale pink solid (hydrates)
Na2SO4
Names: Sodium sulfate, Sodium sulphate, Sulfate of sodium
Appearance: White crystalline solid | hygroscopic ; White hygroscopic solid in various forms