Final answer:
When potassium permanganate is added to ferrous sulphate, a redox reaction occurs.
Step-by-step explanation:
b. Redox reaction
When potassium permanganate (KMnO4) is added to ferrous sulfate (FeSO4), a redox reaction occurs. The potassium permanganate acts as an oxidizing agent, while the ferrous sulfate acts as a reducing agent. The reaction can be represented as follows:
2KMnO4 + 10FeSO4 + 8H2SO4 → 5Fe2(SO4)3 + 2MnSO4 + K2SO4 + 8H2O
This reaction involves the transfer of electrons, where the potassium permanganate is reduced (loses electrons) and the ferrous sulfate is oxidized (gains electrons). Therefore, the answer is b) Redox reaction.