Chlorine gas is prepared commercially by A) electrolysis of carbon tetrachloride. B) oxidation of chloride ion with F₂(g). C) electrolysis of NaCl(aq). D) oxidation of chloride ion with Br₂(aq). E) electrolysis of AlCl₃(aq).

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Chlorine gas is prepared commercially by electrolysis of aqueous sodium chloride (NaCl). This is known as the chlor-alkali process, which also produces sodium hydroxide and hydrogen gas as byproducts. A and E are incorrect because carbon tetrachloride and aluminum chloride do not contain enough chloride ions to produce a significant amount of chlorine gas through electrolysis. B and D are incorrect because they refer to hypothetical reactions that do not occur in reality.

Chlorine Gas Is Prepared Commercially by