Question

what do you call the process of exposing the iron nails placed in wet cloth after 48 hours that resulted to change appearance of iron nails​

Answer 1

For Example, when the iron is exposed to air and moisture, rust formation takes place. Rust is nothing but Iron Oxide; a new substance formed out of the reaction. The colour of the surface of the iron also changes. Hence, rusting of iron is a chemical change.

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