why was magnetisation of iron a physical change
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It is a rearrangement of the atoms already present, without changing their form chemically.
Explanation:A chemical change is the result of a change in the atomic structure of an atom - a gain or loss of electrons.
Magnetization simply aligns the existing iron atoms in a certain way due the effect of a magnetic field on their dipole characteristics. It does not change the chemical composition or structure of the iron atoms in any way.