Question

what is displacement reaction ? explain the statement iron can displace coper from its salt solution but copper cannot displace iron from its salt solution.'

Answer 1

It is a chemical reaction in which a more reactive metal displaces less reactive metal from its salt solution
According to the reactivity series of metals iron comes before copper and hence it is more reactive than copper so it displaces the less reactive metal copper from its salt solution but copper can't do this....
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Answer 2

The reaction in which more reactive metal displace the less reactive metal from its salt solution is called displacement reaction.

CuSO4 + Fe ----- FeSO4 + Cu

iron can displace copper from its salt solution but copper cannot displaces from iron it's solution because iron is more reactive metal than copper. (copper is less reactive metal)