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1.Rusting/corrosion of iron occurs due to presence of oxygen and hydrogen/water moisture and forms a brown coloured  layer of ferrous oxide.
2. Silver reacts with sulphur from the air to form a coating of black silversulphide.
3.copper reacts with moist carbondiaoxide and forms a green layer of copper carbonate.
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3. Copper forms Malachite: CuCO3.Cu(OH)2
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