18. An excess of finely divided iron is stirred up with a solution that contains Cu²⁺ ion, and the system isallowed to come to equilibrium. The solid materials are then filtered off and electrodes of solid copper andsolid iron are inserted into the remaining solution. What is the value of the ratio [Fe²⁺]/[Cu²⁺] at 25°C? Thefollowing standard reduction potentials apply:
(A)1
(B)1.3x1026
(C)2.5x1026
(D)4.4x10-27
(E)8.8x10-27