Copper doesn't replace iron from its solution. - This is because Copper is less reactive than iron. - A more reactive metal displaces the less reactive metal from its solution. - In the given reaction, Iron (Fe) displaces Copper (Cu) by giving up two electrons and gets oxidized and forms a new compound called ferrous sulfate. - Copper gets reduced. - Iron is a reducing agent, meaning that it loses 2 electrons. - mathrmCuSO4 is an oxidizing agent, taking 2 electrons. - The final solution turns green on exposure to moist air. - The reaction is a redox reaction as it involves both loss and gain of electrons by different elements.