Answers

2016-04-13T00:27:20+05:30
Fe is more reactive than copper therefore it displaces copper in the solution of copper sulphate and red brown substance deposit on iron nail which is copper. the reaction is displacement reaction
   CuSO4  +  Fe  ⇒   FeSO4 + Cu
  (copper sulphate)     (ferrous sulphate)
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2016-04-13T11:43:38+05:30
Iron is more reactive than copper..it displace copper from copper sulphate sol.acc to following reaction.....
fe+ cuso4---->feso4+cu
thus as copper sulphate react to form iron 2 sulphate ,the blue colour of copper sulphate fades
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