NTSE Stage 2 SAT 2016 Question Paper

Since Na & Fe both are more reactive than Cu but Fe is having more affinity to form sulphates so, Fe is used to recover copper from an aqueous solution of copper sulphate solution.
${\mathrm{Fe}}_{\left(\mathrm{s}\right)}+{\mathrm{CuSO}}_{4\left(\mathrm{aq}\right)}\to {\mathrm{FeSO}}_{4\left(\mathrm{aq}\right)}+{\mathrm{Cu}}_{\left(\mathrm{s}\right)}$