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Q47 (CISF/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology)

When electricity is passed through brine, it produces

Result
Your answer: —  ·  Correct: B

Explanation

When electricity is passed through brine (a concentrated aqueous solution of sodium chloride, NaCl), it decomposes to form sodium hydroxide (NaOH), chlorine gas (Cl2), and hydrogen gas (H2). This industrial method is known as the Chlor-alkali process.

The chemical reaction is represented as:
2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2(g) + H2(g)

  • Chlorine gas is released at the anode.
  • Hydrogen gas is released at the cathode.
  • Sodium hydroxide solution is formed near the cathode.

Option A (NaCl) is the reactant, not the product. Options C and D involve potassium, which is not present in a sodium chloride solution.

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