dissolution of salt in water
rusting of iron
melting of ice
separating a mixture by distillation
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b...is the answer as rusting of iron takes place with reaction or exposure of oxygen and it's irreversible
The rusting of iron is an example of a chemical change.
A chemical change is a process in which one or more substances are transformed into new substances with different properties and composition. In the case of rusting of iron, iron reacts with oxygen in the presence of water and forms hydrated iron(III) oxide, which has different properties and composition from the original iron. This process is irreversible and involves a chemical reaction.
the reaction of O2&H2O with the iron leads to rusting a type of corrosion. And corrosion is an Electochemical process
