Cathode is a __

Correct answer: B. Cathode is a negatively charged electrode.

In an electrochemical cell, the cathode is a negatively charged electrode. This is where reduction reactions occur, meaning that positively charged ions in the electrolyte move towards the cathode to gain electrons. Understanding the nature of electrodes like the cathode is crucial for Class 12 Physics students, especially when dealing with topics such as electrolysis, galvanic cells, and electric circuits.

Why Cathode is a Negatively Charged Electrode

In electrolytic cells, which are powered by an external voltage source, the cathode is connected to the negative terminal of the power supply. This makes it rich in electrons. As a result, cations (positively charged ions) in the electrolyte are attracted to the cathode, where they gain electrons (undergo reduction). For example, in the electrolysis of molten sodium chloride, Na⁺ ions migrate to the cathode and get reduced to sodium metal.

In contrast, in galvanic (voltaic) cells, which generate electricity through spontaneous chemical reactions, it is still the site of reduction, but it is positively charged. This often confuses students. The key is to remember:

• Cathode = site of reduction (gain of electrons)
• Anode = site of oxidation (loss of electrons)
• The charge of the cathode depends on the type of cell: negative in electrolytic cells, positive in galvanic cells.

How to Remember?

A handy mnemonic is “Red Cat” — Reduction at Cathode. No matter what type of electrochemical cell you’re studying, reduction always happens at the cathode.

Why Not the Other Options?

Let’s break down the incorrect choices:

Option A. Positively charged electrode – This describes the anode in an electrolytic cell, not the cathode.

Option C. A positively charged ion formed in the electrolyte – That’s a cation, not the cathode.

Option D. A negatively charged ion formed in the electrolyte – That’s an anion, not the cathode.

So, next time you see the question “Cathode is a __?”, remember:

• It is the negatively charged electrode in an electrolytic cell.
• It is where reduction (gain of electrons) always happens.
• And it plays a key role in the movement and transformation of ions during electrical reactions.

Stay clear on the definitions, and you will ace those NEET or board exam questions with ease!

Common Doubts in Physics

Differentiate between Rectilinear Motion and Curvilinear Motion	A Concave Lens__ Rays of Light, whereas Convex Lens __ Rays of Light
What is the SI Unit of Mutual Inductance?	The SI Unit of Potential Difference is__
State the Laws of Reflection of Light	Differentiate between Regular and Irregular Reflection