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Copper is precipitated when an iron wire is added to a solution of copper sulphate. Write the equation and indicate which species is oxidised and which is reduced ?
The reaction can be written as ,
CuSO4    +Fe  _________ >   FeSO4     +Cu  
  (aq)          (s)                         (aq)            (s)
In the reaction ,Fe loss electron to become Fe2+ ions and Cu2+ions gain electrons and reduced to Cu .That is the equation is ,
 Cu 2+  +2e-   _______> Cu (s)
  (aq)           
               Fe     _______ >   Fe2+ +2e-
               (s)                    (aq)


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