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 $NaCl$

Answer 1

Answer: (B)

very dilute $NaCl$

Answer 2

In case of very dilute solution of $NaCl$, electrolysis brings in the following changes Anode : $2OH^{-} \to H_{2}O+\frac{1}{2}O_{2}+2e^{-}$ Cathode : $2H^{+}+2e^{-} \to H_{2}$