A dilute ferrous sulphate solution is added to acidified KMnO4. The purple colour fades and disappears. Which is the correct explanation?
KMnO4 is an oxidising agent; it oxidises FeSO4.
FeSO4 acts as an oxidising agent and oxidises KMnO4.
Colour disappears due to dilution; no reaction.
KMnO4 decomposes in presence of FeSO4 to a colourless compound.
Acidified KMnO4 oxidises Fe2+ to Fe3+; MnO4− is reduced → decolourisation.