Copper becomes green when exposed to moist air for a long period. This is due to :-

Question:

Copper becomes green when exposed to moist air for a long period. This is due to :-

  1.  the formation of a layer of cupric oxide on the surface of copper. 

  2.  the formation of basic copper sulphate layer on the surface of the metal 

  3.  the formation of a layer of cupric hydroxide on the surface of copper.

  4. the formation of a layer of basic carbonate of copper on the surface of copper.

Correct Option: , 4

Solution:

Solution Not Required

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