Question

9. Justify that the reaction: 2Cu2O(s) + Cu2S(s) → Cu(s) + SO2(g) is a redox reaction. Also
identify the species which acts as an oxidant and which acts as a reductant.​

Answer 1

Here, in the reaction, the oxidation number of copper decreases from +1 in Cu

2

O or Cu

2

S to 0 in copper metal, therefore, copper is reduced and is. oxidizing agent or oxidants.

Further, the oxidation number of S increases from −2 in Cu

2

S to +4 in SO

2

. Therefore, sulphur is oxidized. Thus, it is reducing agent of reductant.