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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Green

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Black

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Grey

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B
Green

When copper is exposed to moist air for a long time, 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
$2 C u + H_{2} O + C O_{2} + O_{2} ⟶ C u C O_{3} . C u {(O H)}_{2}$

Suggest Corrections

Similar questions

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

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.

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

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

Join BYJU'S Learning Program