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Which outcome arises from excessive concentration polarization during electrodialysis through ion-exchange membranes?

A)Reduced current efficiency and water splitting
B)Increased membrane fouling by organic acids
C)Elevated diffusion and co-ion transport
D)Enhanced electromigration hindering ion separation

💡 Explanation

When concentration polarization becomes excessive, water splitting occurs at the membrane interface because of high electric fields and ion depletion, leading to hydrogen and hydroxide ion production and reduced current efficiency. Therefore reduced efficiency and water splitting result, rather than other outcomes requiring different mechanisms.

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