JAMB - Chemistry (2023 - No. 29)
What is the chemical formula of rust, which is formed on the surface of iron in the presence of oxygen and moisture?
Fe\(_3\)O\(_4\)
FeO
Fe(OH)3
Fe\(_2\)O\(_3\)
Selitys
Rust is a reddish-brown compound that forms on the surface of iron in the presence of oxygen and moisture. Its chemical formula is Fe\(_2\)O\(_3\), indicating the presence of two iron atoms and three oxygen atoms in the compound.