Question

Which of the following statement(s) is/are correct for cathode electrode?

• A. Reduction occurs at cathode
• B. Cathode has positive polarity
• C. Oxidation occurs at cathode
• D. Cathode acts as a sink of electrons

Answer 1

Answer: (A), (B), (D)

Cathode acts as a sink of electrons

In a electrochemical cell, the process of oxidation and reduction takes place simultaneously within the system. The metal strip in the cell is known as electrode. These are electrical conductor used to make contact with a non-metallic part of a circuit.
Reactive metals when in contact with their aqueous solution, the ions in the solution have tendency to get deposited on the metal rod is called cathode.
$Eg:Cu\text{rod in}CuS{O}_4\text{solution}$
$C{u}^{2+}\left(aq\right)+2e^{-}\to C{u}^{2+}\left(s\right)\left(\text{at cathode}\right)$
Characteristics of cathode:
1. Reduction takes place at cathode.
2. Cathode acts as a sink of electrons.
3. Cathode has positive polarity.

Thus, statements (a), (b) and (d) are correct.