Question

what is corrosion?state the conditions necessary for rusting of iron. how rusting is harmful?

Answer 1

The slow eating up of metals layer by layer due to the reaction with moisture present in air is known as corrosion.

The condition required for rusting of iron is presence of moisture & iron should be coating free.

Rusting is harmful because it destroy the quality of metal and also reduce its strength.

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Answer 2

Corrosion is a gradual deterioration of metals on interaction with their environment as a result of chemical reactions between them.
The presence of moisture in the air and sunlight are the necessary conditions for rusting.Also the iron should not be coated with any type of metal
Rusting may make the metals to become weak and make them lose their lustrous surface.