Concept:A physical change alters the form, shape, or state of a substance without changing its chemical identity or forming a new substance.
Explanation:In a physical change, the chemical composition remains unchanged before and after the change.
Changes like melting, freezing, or magnetization affect only physical properties such as shape, state, or magnetism.
Fermentation of food produces new substances, so it is a chemical change.
Respiration involves chemical reactions that release energy and form new products.
Lighting a match causes combustion, producing ash, smoke, and new gases.
Magnetization of iron only rearranges the magnetic domains in the iron.
No new chemical substance is formed during magnetization.
The change is reversible because the iron loses its magnetism when the magnet is removed.
Hence, magnetization of iron is a temporary physical change.
Answer:C. Magnetization of iron