When copper is exposed to moist air for a long time then a layer deposits on its surface due to corrosion. The colour of this layer is:

Brown

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Green

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Black

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Grey

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Solution

The correct option is B Green
When copper is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of copper hydroxide $C u {(O H)}_{2}$ and copper carbonate $C u C O_{3}$ . The following is the reaction
$2 C u + H_{2} O + C O_{2} + O_{2} ⟶ C u C O_{3} . C u {(O H)}_{2}$

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Similar questions

What happens when a copper vessel is exposed to moist air for a long time ?

When a vessel is exposed to moist air for a long time,then a green coating is formed on its surface.The vessel must be made of :

(a) zinc

(b) magnesium

(d) copper

When a copper object is exposed to moist air for a long time,then a green coating is formed on its surface.

(a) What is the material of the green coating ?

(b) State whether the green coating is acidic or basic.

Identify the colour of deposit formed on the surface of copper when it is exposed to moist air.

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