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

(i) Melting of iron metal, (iii) Bending of an iron rod and (iv) Drawing a wire of iron metal are physical changes because in all these processes, no new substance is formed and chemical properties of the original substance remain same. Shape and size of a substance can change in a physical change.

In case of rusting of iron the chemical composition of iron changes.