Question

Identify the substance oxidised, reduced, oxidising agent and reducing agent in the reaction: 

2Cu₂O + Cu₂S → 6Cu + SO₂

Answer 1

In this reaction, Cu is reduced from +1 state to zero. oxidation state and S is oxidised from -2 state to +4 state. Cu₂O helps S in Cu₂S to increase its oxidation number. Therefore, Cu(l) is the oxidising agent. S of Cu₂S helps Cu both in Cu₂S  itself and Cu₂O to decrease its oxidation number. Therefore, S of Cu₂S is the reducing agent.