Chemistry
Rust is:
- hydrated iron oxide
- hydrated copper sulphate
- anhydrous iron oxide
- none of the above
Air
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Answer
hydrated iron oxide
Reason — The reddish brown powdery mass that gets coated on the surface of some iron object when kept in moist air for a few days is called as rust. It is chemically know as hydrated iron oxide (Fe2O3.xH2O)
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