COMEDK2019ChemistryElectrochemistry
Electrolysis of brine gives a mixture of
Options
- AH ₂, Na ₂ Cl ₂
- BCl ₂, H ₂, NaOH
- CH ₂, O ₂, NaOH
- DO ₂, Cl ₂, NaOH
Correct answer
B. Cl ₂, H ₂, NaOH
Step-by-step solution
Brine is a solution of sodium chloride and water. On electrolysis, it gives chlorine ( Cl ₂ ) , hydrogen ( H ₂ ) and sodium hydroxide ( NaOH ) . At cathode 2 H ⁺(a q)+2 e⁻ H ₂2 H ₂ O +2 e⁻ H ₂+2 OH ⁻(a q) At anode 2 Cl ⁻ Chlorine Cl ₂ +2 e⁻ The hydroxide ion, with the unchanged sodium ion, forms NaOH . Na ⁺+ OH ⁻ Sodium hydroxide NaOH