Which of the following is a example of a chemical change?

A chemical change is a process that results in the formation of one or more new substances with different properties from the original substances. Out of the options provided, rusting of iron is an example of a chemical change. Rusting is a process in which iron reacts with oxygen and water to form hydrated iron (III) oxide, a compound with different properties from iron. This process is irreversible and involves the breaking and forming of chemical bonds. Dissolution of salt in water, melting of ice, and separating a mixture by distillation are physical changes because they do not result in the formation of new substances with different properties.