19. Which statement below is NOT correct? (A)Redox reactions with a positive △G0 would have a negative electromotive force (B) The electromotive force reaches a maximum value when the redox reaction is at equilibrium (C) The cell voltage of a galvanic cell may change with the ion concentrations in the cell (D) Electrolytic cells use electric energy to force non-spontaneous redox reactions to occur (E) The electromotive force of a galvanic cell is an intensive property