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

What is the chemical formula of rust, which is formed on the surface of iron in the presence of oxygen and moisture?
A. Fe3O4
B. FeO
C. Fe(OH)3
D. Fe2O3

Correct Option: Answer is D
Rust is a reddish-brown compound that forms on the surface of iron in the presence of oxygen and moisture. Its chemical formula is Fe22O3

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