Why copper objects turn greenish in colour when exposed to air for a long time

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Solution

$C o p p e r r e a c t s w i t h a t m o s p h e r i c c a r b o n d i o x i d e, m o i s t u r e a n d o x y g e n f o r m i n g C o p p e r c a r b o n a t e C u + A t m o s p h e r e \to C o p p e r c a r b o n a t e C u + C O_{2} + \frac{1}{2} O_{2} \to C u C O_{3} D u e t o t h e f o r m a t i o n o f c o p p e r c a r b o n a t e, c o p p e r t u r n s t o g r e e n i n c o l o u r .$

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