When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium hydroxide. This process is called:
Chlor-alkali process
The Chlor-alkali process is the electrolytic decomposition of brine (aqueous sodium chloride) to produce sodium hydroxide, chlorine and hydrogen.
Filtration, polymerisation and sublimation describe entirely different chemical or physical processes, not this specific electrolysis reaction.
Hence, Chlor-alkali process is the correct answer.
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