If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

copper sulphide

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copper carbonate

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copper nitrate

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green copper

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Solution

The correct option is B
copper carbonate

Metals are usually pretty reactive. Pure copper metal when left exposed to air starts reacting with some gases in air like carbon dioxide and water vapour. This leads to the formation of copper carbonate and others.

Copper carbonate makes the shiny copper metal become dull and greenish in colour.

If you see this, don't worry. It's not that harmful!

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