Question

what is the change in oxidation number in copper in the reaction below cu2s(s)+o2(g)_2cu(s)+so2(g)

Answer 1

Answer:

Copper goes from +1 oxidation state to +2 oxidation state.

In Cu2S, One copper atom gives 1 electron. So oxidation no. = 1

In CuS, one copper atom gives 2 electrons to sulphur.

So, oxidation no. = 2