Discussion
Decomposition potential is the minimum voltage at which
Answer: A
Correct answer: continuous electrolysis begins
Below the decomposition potential only a small transient current flows while the electrodes polarise, and it then falls almost to nothing. Above it the products are discharged continuously and the current rises steadily with voltage. The value exceeds the reversible EMF of the reaction by the overvoltages at the two electrodes and by the resistance drop of the electrolyte.
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