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From the reactions given below, identify...

From the reactions given below, identify the most reactive and the less reactive metal among iron,copper and magnesium.
`Fe (s) + CuSO_4 (aq) rarr FeSO_4 (aq) + Cu (s)`
`Mg (s) + FeSO_4 (aq) rarr MgSO_4 (aq) + Fe (s)`

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