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CBSE Questions for Class 7 Chemistry Physical And Chemical Changes Quiz 8 - MCQExams.com
CBSE
Class 7 Chemistry
Physical And Chemical Changes
Quiz 8
Chemically rust is
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Hydrated ferrous oxide
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Only ferric oxide
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Hydrated ferric oxide
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None of these
Explanation
Chemically rust is hydrated ferric oxide. It is formed by the action of atmospheric oxygen gas and water on iron metal. The chemical formula of rust is $$Fe_2O_3$$.
The process of rusting can be shown by the reaction,
$$Fe +O_2 + H_2O \longrightarrow Fe_2O_3$$
For rusting present of water and oxygen gas is essential.
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