Question

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

• A. $OH ^{-}$is formed at cathode
• B. $Cl _2$ is formed at cathode
• C. $O _2$ is formed at cathode
• D. $H _2$ is formed at anode

Answer 1

Answer: (A)

$OH ^{-}$is formed at cathode

Answer 2

Electrolysis of brine solution
NaCl(aq.)⟶Na(aq)+​+Cl(aq) +​
At anode :2Cl(aq.) +​⟶ (Major) Cl2​(g)+2e−​
2H2​O(ℓ)​⟶ Minor O2(g)​​+4H(aq)+​+4e−
At Cathode : 2H2​O(ℓ)​+2e−⟶H2(g)​↑+2OH(aq)−​
2Na++2OH−⟶2NaOH

So, the correct option is (A): $OH^−$ is formed at cathode.