Which of the Following Reactions Will Require the Use of an Inert

Multiple Choice

Which of the following reactions will require the use of an inert electrode when used in a voltaic cell?

A) Co(s) + 2 Ag⁺(aq) → 2 Ag(s) + Co²⁺(aq)
B) 3 Ni(s) + 2 Au³⁺(aq) → 3 Ni²⁺ + 2 Au(s)
C) Cu(s) + 2 Ag⁺(aq) → Cu²⁺(aq) + 2 Ag(s)
D) Zn(s) + 2 MnO₂(s) + 2 NH₄⁺(aq) → Zn²⁺(aq) + Mn₂O₃(s) + 2 NH₃(aq) + H₂O(l)
E) 3 Zn²⁺(aq) + 2 Al(s) → 3 Zn(s) + 2 Al³⁺(aq)