Question

In the process of electrolysis using active electrodes, the concentration of cathode ________ and of anode __________.

• A. increases, decreases
• B. decreases, decreases
• C. increases, increases
• D. decreases, increases

Answer 1

The correct option is A increases, decreases

$M\to M^{+}+e^{-}$ (at anode)

$M^{+}+e^{-}\to M$ (at cathode)

The ions from anode get into the solution and ions from solution deposits on the cathode.

$\therefore$ Concentration of metal at anode decreases and concentration of metal at cathode increases.

Hence, option A is correct.