Justify that the following reactions are
redox reaction; identify the species
oxidized/reduced, which acts as an
oxidant and which act as a reductant.
2Cu2o (s) + Cu2S (s) ---------›6Cu (s) + S02 (g)
Answers
Answer:
To know the species which are oxidized/reduced and which acts as an oxidant and which act as a reductant let's assign oxidation number to each species in reaction.
+1 -2 +1 -2 0 +4 -2
2Cu₂O(s) + Cu₂S(s) ====> 6Cu(s) + SO₂(g)
In this reaction we can see that,
1. Copper(Cu) gets reduced to zero oxidation state from +1 state.
2. Sulphur gets oxidised to +4 state from -2 state.
And we can also say that this is a redox reaction.
Redox reaction is that reaction in which oxidation numbers changes of atoms.
3. Cu is an oxidant because Cu₂O helps sulphur in Cu₂S to increase its oxidation number.
4. Copper from both in Cu₂S and Cu₂O is helped by sulphur to decrease its oxidation number which shows that sulphur of Cu₂S is reductant.
Species to found=>
1. Oxidized => Sulphur(S)
2. Reduced => Copper(Cu)
3. Oxidant => Copper(Cu)
4. Reductant => Sulphur(S)