Question

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

• A. $O{H}^{-}$is formed at cathode
• B. $C{l}_2$ is formed at cathode
• C. $O_2$ is formed at cathode
• D. $H_2$ is formed at anode

Answer 1

Answer: (A)

Electrolysis of brine solution
$NaCl(aq.)⟶N{a}_{(aq)}^{+}+C{l}_{\text{(aq) }}^{+}$
At anode $:2C{l}_{\text{(aq.) }}^{+}⟶\underset{\text{ (Major) }}{C{l}_2(g)+2e^{-}}$
$2H_2{O}_{(\ell )}⟶\underset{\text{ Minor }}{O_{2(g)}}+4H_{(aq)}^{+}+4e^{-}$
At Cathode : $2H_2{O}_{(\ell )}+2e^{-}⟶H_{2(g)}\uparrow +2O{H}_{(aq)}^{-}$
$2N{a}^{+}+2O{H}^{-}⟶2NaOH$