The reddish–brown rust on iron roofing sheets consists of

  • A Fe3 + (H2O)6
  • B FeO.H2O
  • C Fe2O3.XH2O
  • D Fe3O4.2H22O
jamb 2017chemistry

The correct answer is C. Fe2O3.XH2O

Iron [Fe] reacts with H2 in the presence of oxygen to form a rust.

4Fe + 3O2 → 2 Fe2O2

Fe2O3 + H2O → Fe2O3.H2O

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