(D) Rust is a hydrated iron$(III)$ oxide,which is chemically represented as $Fe_2O_3 \cdot xH_2O$. It is formed by the oxidation of iron in the presen

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(D) Rust is a hydrated iron$(III)$ oxide,which is chemically represented as $Fe_2O_3 \cdot xH_2O$. It is formed by the oxidation of iron in the presence of moisture and oxygen. Among the given options,$Fe_2O_3 + Fe(OH)_3$ represents the composition of rust as a mixture of hydrated oxides and hydroxides.