Answer:
Iron is more reactive than Cu. So it displaces Cu from copper sulphate solution. Thus, blue colour of the \[CuS{{O}_{4}}\] solution fades and colour of the solution turns green due to the formation of ferrous sulphate solution. This is a displacement reaction. \[\underset{\text{(blue)}}{\mathop{CuS{{O}_{4}}\left( aq \right)}}\,+Fe\left( s \right)\to \underset{\text{(Green)}}{\mathop{FeS{{O}_{4}}(aq)}}\,+Cu(s)\]
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