In the electrolysis of which solution, OH- ions are discharged in preference to Cl- ions ?

Question

In the electrolysis of which solution, OH- ions are discharged in preference to Cl- ions ? (A) Dilute NaCl (B) Very dilute NaCl (C) Fused NaCl (D) Solid NaCl

Tardigrade Admin · Accepted Answer

In very dilute solution of NaCl, the following reaction takes place on electrolysis. Anode: 2OH- arrow H2O + 1/2O2 + 2e- Cathode: 2H+ + 2e- arrow H2

Q. In the electrolysis of which solution, $O H^{-}$ ions are discharged in preference to $C l^{-}$ ions ?

Dilute NaCl

Very dilute NaCl

Fused NaCl

Solid NaCl

In very dilute solution of $N a Cl$ , the following reaction takes place on electrolysis.
Anode $: 2 O H^{-} \to H_{2} O + 1/2 O_{2} + 2 e^{-}$
Cathode $: 2 H^{+} + 2 e^{-} \to H_{2}$

Q. In the electrolysis of which solution, OH− ions are discharged in preference to Cl− ions ?