Determine Which of the Following Pairs of Reactants Will Result

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25 °C.

A) Pb²⁺(aq) + Cu(s) ; if E^o(Pb²⁺/Pb) = -0.13V and E^o(Cu²⁺/Cu) = +0.16V
B) Ag⁺(aq) + Br⁻(aq) ; if E^o(Ag⁺/Ag) = 0.80V and E^o(Br₂/Br^-) = +1.09V
C) Li⁺(aq) + Al(s) ; if E^o(Li⁺/Li) = -3.04V and E^o(Al³⁺/Al) = -1.66V
D) Fe³⁺(aq) + Ni(s) ; if E^o(Fe³⁺/Fe) = -0.04V and E^o(Ni²⁺/Ni) = -0.23V
E) Cd²⁺(aq) + I^-(aq) ; if E^o(Cd²⁺/Cd) = -0.40V and E^o(I₂/I^-) = + 0.54V

Correct Answer:

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