Give chemical formula of rust

Answer: Rust is made up of hydrated ferric oxide, which has the chemical formula Fe₂O₃.xH₂O. Rust is the generic name for iron oxide, a highly common chemical. Because iron is so easily combined with oxygen, iron oxide, or Fe₂O₃is abundant. In fact, pure iron is rare in nature.

Rust is a brown-orange colour that looks like iron oxide but isn’t. When applied over a standard source of tungsten light, it is a widely used colour in stage lighting that looks roughly the same as photography safety lamps.