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Which of the following changes is an indication of a chemical reaction?

Answer and explanation

Correct answer: Rusting of iron

When iron rusts, it reacts with oxygen and moisture to form a new substance, hydrated iron oxide (rust). Therefore, rusting is a chemical change. In contrast, boiling water and melting wax are only changes of state, while dissolved salt can be recovered from water by evaporation.

Related tags

Chemical ReactionsChemical ChangeRustingIron OxidePhysical ChangeClass 10 Science

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