When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium hydroxide. This process is called:

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RRB NTPC - 2025

General Science

When electricity is passed through an aqueous solution of sodium chloride (called brine), it decomposes to form sodium hydroxide. This process is called:

This question was previously asked in

RRB NTPC 2025 Under Graduate CBT 2 Question Paper PDF (17-Sep-2026) (Shift 1)

Filtration process

Chlor-alkali process

Polymerisation process

Sublimation process

The correct answer is

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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