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Reaction of Metals with Oxygen

The reddish b...

Question

The reddish brown layer of _________ on metal is called as rust.

A

sodium oxide

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B

copper oxide

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C

calcium oxide

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D

ferric oxide

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Solution

The correct option is D
ferric oxide

Rusting involves slow oxidation of iron in presence of air and moisture.

4Fe + 3O₂ → 2Fe₂O₃

Iron Oxygen Ferric oxide

2Fe₂O₃ + xH₂O → Fe₂O₃.xH₂O

(moisture) Rust

Hydrated iron (III)oxide

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Reaction of Metals with Oxygen

Standard VIII Chemistry

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