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Question

Any article of iron if left in open for some time, acquires a film of brownish substance (rust) having chemical formula:

A
Fe3O4
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B
Fe2O3
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C
FeO
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D
Fe(OH)2
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Solution

The correct option is B Fe2O3
Iron reacts with air to form iron oxide(III) which is known by the name rust or rusting of iron. Rust is an iron oxide or red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Rust consist of hydrated iron oxide.

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