Which of the following prtoducts is not formed at the anode in the hall -Heroult electrolysis process?

Which of the following prtoducts is not formed at the anode in the hall -Heroult electrolysis process?
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Which of the following prtoducts is not formed at the anode in the hall -Heroult electrolysis process? A. `CO_(2)` B. `O_(2)` C. `Cl_(2)` D. `F_(2)`
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