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A metal X left in moist air for a longer time, loses its shiny brown surface and gains a green coat.

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A metal X left in moist air for a longer time, loses its shiny brown surface and gains a green coat. Why has this happened? Name and give the chemical formula of this given coloured compound and identify the metal. List two ways to prevent this Process.

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The metal has corroded because of being exposed to moist air. Green compound is basic copper carbonate [CuCO3. Cu(OH)2]

The metal is copper.

Two ways to prevent this process :

Painting, Greasing, Oiling, Galvanizing

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