Which outcome of the **Hall**–**Héroult process** will occur as cryolite ratio decreases toward its limit?

💡 Explanation

Decreasing the cryolite ratio increases the ionic resistance near the anode in Hall–Héroult cells because **oxide ion depletion** causes anode overpotential buildup; therefore lowered concentrations yields unwanted reactions, rather than benefiting operation as options suggest under other conditions.

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