(a) NaCl solution and copper metal
(b) MgCl2 solution and aluminium metal
(c) FeSO4 solution and silver metal
(d) AgNO3 solution and copper metal
Answer:
The right answer is option d, which is AgNO3 solution with copper. Copper displaces the silver cations (reducing them to the elemental metal), oxidizing copper to Copper II cations (Cu2+) and releasing it into solution in the process. As a result, silver metal will precipitate out, leaving a copper II nitrate solution.
