The formation of brown coloured flaky layer (rust) on iron nail when kept in air for a long time is a _________.

chemical change

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physical change

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reversible change

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fast change

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Solution

The correct option is A chemical change
Chemical changes can be defined as the change in which the chemical composition of substances is altered and some new product is formed.
Iron nail in the presence of moist air forms a brown coloured flaky layer on the surface called rust. Rust has different chemical composition and properties as compared to that of an iron nail. Thus, it is a chemical change.

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