Question
In the reactions given below, identify the species undergoing oxidation and reduction:
Solution
(i) H2S is oxidised because a more electronegative element, chlorine is added to hydrogen or a more electropositive hydrogen has been removed from S and chlorine is reduced because of the addition of hydrogen to it.
(ii) Aluminium is oxidised due to the addition of oxygen to it and ferrous ferric oxide (Fe3O4) is reduced due to the removal of oxygen from it.
(iii) Sodium is oxidised while hydrogen is reduced.
