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Chemistry
Copper becomes green when exposed to moist air for a long period. This is due to:
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Q. Copper becomes green when exposed to moist air for a long period. This is due to:
JEE Main
JEE Main 2014
Redox Reactions
A
the formation of a layer of cupric oxide on the surface of copper.
38%
B
the formation of a layer of basic carbonate of copper on the surface of copper.
31%
C
the formation of a layer of cupric hydroxide on the surface of copper.
17%
D
the formation of basic copper sulphate layer on the surface of the metal.
14%
Solution:
Copper when exposed to moist air having $CO_2$. It gets superficially coated with a green layer of basic carbonate $ CuCO_3. Cu (OH)_2$.