JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Redox Reactions and Electrochemistry

The product, which is not obtained during the electrolysis of brine solution is

Answer: (D)

Solution

Brine is an aqueous solution of NaCl. During electrolysis: At the cathode (reduction):

2 H_{2} O + 2 e^{-} \to H_{2} + 2 OH^{-}

. At the anode (oxidation):

2 Cl^{-} \to Cl_{2} + 2 e^{-}

. The

Na^{+}

ions remain in solution with

OH^{-}

to form NaOH. The products are

H_{2}

Cl_{2}

, and NaOH. HCl is not formed because

H_{2}

and

Cl_{2}

are evolved as separate gases at different electrodes.

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option