Molten cadmium bromide is electrolyzed between two nonreactive electrodes. Write the equations for the anode and cathode reactions. What possible changes might occur at the anode and cathode if zinc electrodes were substituted for the nonreactive electrodes?

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I have been using as a rule that the anode compartment contains thespecies with smallest standard reduction potential, but thefollowing question that does not seem to work. Here is thequestion

What reactions take place at the cathode and the anode when each ofthe following is electrolyzed

(c) molten MnI2

The cathode
Mn(2+)+ 2e- -> Mn E(Standard)=-1.18V
The anode
2I- -> I2 + 2e- E=-.54V

How do we know what is Cathode and Anode in this case?