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Select the statements that correctly describe a concentration cell. A. The cell emf is generated because of a difference in concentration. B. A concentration cell spontaneously generates electricity. C. The electrode and the electrolyte may be different materials as long as the electrolytes are at different concentrations. D. The anode and cathode half-cells cannot reach the same concentration. E. The electrode and the electrolyte are the same materials in both half-cells.

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