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(B) The recovery of copper from a $CuSO_4$ solution is based on the displacement reaction.According to the electrochemical series,metals with a more n

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Iron

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(B) The recovery of copper from a $CuSO_4$ solution is based on the displacement reaction.According to the electrochemical series,metals with a more negative standard reduction potential can displace metals with a less negative (or more positive) reduction potential from their salt solutions.Since the standard reduction potential of $Fe$ $(-0.44 \ V)$ is lower than that of $Cu$ $(+0.34 \ V)$,iron can displace copper from its solution.The reaction is: $Fe(s) + CuSO_4(aq) \rightarrow FeSO_4(aq) + Cu(s)$.

From a solution of $CuSO_4$,the metal used to recover copper is

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