A copper article if exposed to air, develops a green coloured layer of:

copper carbonate

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copper oxide

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copper sulphate

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copper sulphide

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Solution

The correct option is A
copper carbonate

Many metals when exposed to atmosphere react with moist air. This is called as the corrosion of the metals as it causes their degradation and affects their usage.

A copper article when exposed to air reacts with water vapour, gases such as carbon dioxide. As a result, it forms a green coloured layer of copper carbonate and copper hydroxide.

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Similar questions

When copper vessels are exposed to moist air for a long time, a green coating is formed. Which are the constituents of the coating?
(i) Copper hydroxide
(ii) Copper carbonate
(iii) Copper oxide

Q. Write the formula of the following compounds.
calcium hydroxide, copper chloride, iron sulphate, sodium carbonate, copper nitrate, copper oxide, lead sulphide, magnesium chloride, zinc sulphate, potassium hydroxide.

Q. State how would you prepare copper (II) oxide from
(a) copper nitrate.
(b) copper carbonate.
(c) copper sulphate.

Q. If copper is exposed to wet air for an extended period, it develops a greenish coating. Why?

Q. Copper carbonate decomposes to copper oxide and carbon dioxide. Guess the colour of the residue.

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