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Which outcome occurs when protium-rich water undergoes electrolysis?

A)Deuterium concentration progressively increases
B)Hydrogen gas production remains constant
C)Electrolyte conductivity rapidly decreases
D)Electrodes become entirely passivated

💡 Explanation

Isotopic fractionation occurs during electrolysis; protium reacts faster due to its lower mass, therefore deuterium accumulates in the remaining water because the kinetic isotope effect favors lighter isotopes reacting first, rather than a constant ratio.

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