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Q72
(CDS-II/2026)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
When electricity is passed through an aqueous solution of sodium chloride, it decomposes to form
Result
Your answer:
—
·
Correct:
B
Explanation
When electricity is passed through an aqueous solution of sodium chloride (commonly known as brine), it decomposes to form sodium hydroxide (NaOH). This industrial procedure is called the chlor-alkali process because the products formed are chlorine (chlor) and sodium hydroxide (an alkali).
The chemical reaction is represented as:
2NaCl(aq) + 2H2O(l) → 2NaOH(aq) + Cl2(g) + H2(g)
During electrolysis:
- Chlorine gas (Cl2) is released at the anode (positive electrode).
- Hydrogen gas (H2) is released at the cathode (negative electrode).
- Sodium hydroxide (NaOH) solution is formed near the cathode.
Option A (NaHCO3) is typically produced via the Solvay process, while HCl and HOCl are not the primary decomposition products of this specific electrolytic reaction.
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SIMILAR QUESTIONS
When electricity is passed through brine, it produces