Question

Magnetization of iron is a physical change but rusting of iron is chemical change

Answer 1

Magnetization of iron occurs to due to the temporary alignment of the electrons present in it in one direction only. This is done by rubbing the north pole of the magnet on the middle if the magnet towards its end. It is temporary because after some time, the electrons divert from the alignment.
However, iron rusts because its surface adsorbs oxygen (meaning only the surface reacts with oxygen). It is a chemical reaction where new compounds are formed. So obviously, rusting of iron is a chemical change, but magnetization of iron is not.

Answer 2

Explanation:

Magnetization of iron is a physical change because its chemical properties remain same, no new substances are formed and this is a reversible change.

But, rusting of iron is a chemical change because its chemical properties are altered, new substance that is ferric oxide (rust) is formed when Iron, Oxygen and water reacts together and this is a irreversible change.

Hope it helps you.