How is the corrosion of copper a redox reaction? Specify oxidation no., reducing and oxidizing agent, what is oxidized and reduced?

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Solution

$C o p p e r r e a c t s w i t h o x y g e n a n d f o r m s c o p p e r o x i d e . 4 C u + O_{2} \to 2 C u_{2} O H e r e I n t h e L H S s i d e c o p p e r o x i d a t i o n n u m b e r i s 0 a n d i n t h e R H S s i d e c o p p e r o x i d a t i o n n u m b e r i s C u_{2} O 2 x + - 2 = 0 2 x = + 2 x = + 1 S o t h e r e i s i n c r e a s e i n o x i d a t i o n n u m b e r . T h a t m e a n s c o p p e r u n d e r g o e s o x i d a t i o n a n d c o p p e r i s a r e d u c i n g a g e n t . O x y g e n o x i d a t i o n n u m b e r c h a n g e d f r o m 0 t o - 2 i n t h e R H S s i d e . T h e r e i s d e c r e a s e i n o x i d a t i o n n u m b e r . S o i t s a r e d u c e d a n d o x y g e n a c t s a s a n o x i d i s i n g a g e n t . A s b o t h o x i d a t i o n a n d r e d u c t i o n o c c u r t h i s r e a c t i o n i s a r e d o x r e a c t i o n .$

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