Explain how painting of an iron gate prevents it from rusting.

When Iron (Fe metal) comes into contact with water and oxygen (from air) it 'rusts' i.e. turns into Iron oxide Fe2O3.xH2O

Inorder to break the surface contact between iron , water and oxygen it is painted, thus prevents formation of rust.

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When an iron gate is painted or applied grease, it forms a layer of coat which prevents the iron gate to come in contact with oxygen and water.Therefore, it helps us to prevent rusting of iron.

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