Which expression(s) are incorrectly defined? I- Ohmic potential is the voltage that overcomes its electrical resistance in an electrochemical cell while current is flowing. II- Concentration polarization occurs when the concentrations of reactants or products on the electrode surface are greater than that in the whole solution. III- Overvoltage is only the voltage required to overcome the activation energy of the reaction at the cathode. cathode only. IV- E = Ekatode - Eanode - IR - overvoltage - concentration polarization

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