Question

What is the meaning of Fe2O3.xH2O

Answer 1

Rust is a substance which is formed when iron compound react with water in presence of air then corrison of reaction tk place and iron is corrode to hydrated ferric oxide .its a oxidation reaction tk place in the presence of o2

Answer 2

Fe2O3 refers to hydrated ferric oxide/iron (II) oxide containing variable number of water molecules.

This is commonly called Rust.