Q.

Which one of the following statements is correct for electrolysis of brine solution ? 

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a

H2 is formed at anode

b

O2 is formed at cathode

c

Cl2 is formed at cathode 

d

OH is formed at cathode

answer is A.

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Detailed Solution

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Chemical Reactions

NaCl (aq.) → Na⁺(aq) + Cl⁻(aq)

At Anode:

  • 2Cl⁻(aq.) → Cl₂(g) + 2e⁻ (Major)
  • 2H₂O(l) → O₂(g) + 4H⁺(aq) + 4e⁻ (Minor)

At Cathode:

  • 2H₂O(l) + 2e⁻ → H₂(g) ↑ + 2OH⁻(aq)

2Na⁺ + 2OH⁻ → 2NaOH

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Which one of the following statements is correct for electrolysis of brine solution ?