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Question on: JAMB Chemistry - 2023

What is the chemical formula of rust, which is formed on the surface of iron in the presence of oxygen and moisture?

A

Fe\(_3\)O\(_4\)

B

FeO

C

Fe(OH)3

D

Fe\(_2\)O\(_3\)

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Correct Option: D

The correct answer is D. Fe ₂O ₃. Rust is primarily hydrated iron(III) oxide. The chemical formula for rust is Fe ₂O ₃ · xH ₂O, where x is a variable representing the number of water molecules. The formula Fe ₂O ₃ represents iron(III) oxide (ferric oxide), which is the main component of rust.

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