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Grade: 8
        
why is copper when exposed to moist air turn their layer into green coating ?
 
9 months ago

Answers : (5)

Arun
13847 Points
							Dear Suraj
green coating appears on the surface of copper vessel because the copper on getting exposed to moist air slowly forms calcium carbonate and copper hydroxide which is called tarnish . the statue of liberty has turned green because of tarnish
it can be reprsented as :- h2o +co2 +o2 +cu = cu {oh}2 +caco3
Regards
Arun (askIITians forum expert)
9 months ago
Akachdeep Medhi
89 Points
							
Copper develops a green coating when it s exposed to humid air containing CO2.A reaction takes place with CO2 and moist air (H2O) and forms basic copper carbonate{CuCO3.Cu(OH)2}.This compound is green in colour.
With regards Akash.
7 months ago
amisha
31 Points
							
copper turned into green coating because of corrosion
coroision is a process in which metal layer is eaten up when exposure to air and water .
hence due to exposure the copperstarts corroding and turned into green coating
 
7 months ago
Siddharth Singh
98 Points
							Dear Surajgreen coating appears on the surface of copper vessel because the copper on getting exposed to moist air slowly forms calcium carbonate and copper hydroxide which is called tarnish . the statue of liberty has turned green because of tarnishit can be reprsented as :- h2o +co2 +o2 +cu = cu {oh}2 +caco3Regards
						
6 months ago
Scholr Boy
87 Points
							

Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of copper carbonate and copper hydroxide. This gives a green colour to the surface of copper metal.  

The reaction is as follows:

2Cu + H2O + CO2 + O2 →  Cu(OH)2  +  CuCO3
3 months ago
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