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Q.

During the Hall-Heroult process of preparing Al metal from purified bauxite, if 3 moles of O2 is formed at anode the number of moles of Al formed at cathode is 

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answer is 4.

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Detailed Solution

6O2−⟶3O2+12e− and 4Al3++12e−⟶4Al.

This shows that for every 3 moles of oxygen 4 moles Al is formed.

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