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Subjects
Science CBSE
Class 7
Physical and chemical changes
Textbook questions
12.
Exercises XII
Exercise condition:
3
m.
Explain how painting of an iron gate prevents it from rusting.
Rusting is assisted by both
vapour
moisture
(water) and
vapour
air
(oxygen). By painting an iron gate, we prevent its contact with the air and moisture present in the
troposphere
atmosphere
. Therefore, rusting is prevented.
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