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If a salt is obtained from seawater and used to make chlorine and sodium hydroxide, which common salt is it?

Answer and explanation

Correct answer: Sodium chloride

The governing concept is the chlor-alkali process. Common salt, sodium chloride (NaCl), is obtained abundantly from seawater and dissolved in water to form brine. Electrolysis of brine produces chlorine gas at the anode, hydrogen gas at the cathode, and sodium hydroxide in solution: 2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂. Therefore option A is correct; the other salts do not give this chlor-alkali combination.

Related tags

Common SaltChlor-Alkali ProcessSeawaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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