Chemically rust is: (1) Hydrated ferrous oxide (2) Hydrated ferric oxide (3) Only ferric oxide (4) None of these

Answer: (3) Only ferric oxide

Iron blends with oxygen from the air in the presence of moisture to create a brown chemical substance known as rust.

The chemical formula of rust is a hydrated ferric oxide (Fe₂O₃.nH₂O).

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