Answer:
Using activity series of metals (search topic), elements at top of series will replace any metal element below it but elements low on the series will not replace elements above. See reactions in explanation.
Explanation:
Pb(NO₃)₂(aq) + Mg(s) => Mg(NO₃)₂(aq) + Pb(s)
Cu(NO₃)₂(aq) + Mg(s) => Mg(NO₃)₂(aq) + Cu(s)
Fe(NO₃)₂(aq) + Mg(s) => Mg(NO₃)₂(aq) + Fe(s)
Cu(NO₃)₂(aq) + Pb(s) => Pb(NO₃)₂(aq) + Cu(s)
Fe(NO₃)₂(aq) + Pb(s) => No Reaction (Pb will not replace Fe according to the activity series of metals).