Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
Rusting is a chemical change where iron and oxygen react together to make a new substance of completely different properties called iron oxide.
The chemical reaction is given as:
4Fe + 3O2 → 2Fe2O3
Rest all are physical changes.