Class 12 Chemistry Chapter 2, titled Electrochemistry, deals with the study of how electricity and chemical reactions are connected. It covers key ideas like redox reactions, galvanic cells, electrolysis, electrode potential, Nernst equation and conductance of electrolytic solutions. This chapter also introduces you to real-life applications such as batteries, corrosion, and fuel cells. With both theory and numericals, this chapter carries a lot of weight in board exams and competitive entrances like NEET and JEE.
I’m writing on this topic because Electrochemistry is one of those chapters which often seems tough to students due to so many equations and terms like EMF, cell potential, resistance, etc. But if broken down properly, it becomes simple and even interesting. I remember during my own preparation, once I learnt to connect formulas to concepts like how a battery works or why metals corrode, the chapter became very logical. Many students struggle because they only try to mug up formulas without understanding. So in this article, I’ve explained the important parts of the chapter and shared how to access the official NCERT PDF for this topic to help you study more efficiently.
Important Concepts Covered in Chapter 2 – Electrochemistry
Let’s break down the major topics of this chapter so that it becomes easy to revise:
1. Electrochemical Cells
- Galvanic cells (like Daniell cell)
- Cell reactions and electrode processes
- Representation of a cell using cell notation
2. EMF of a Cell
- Electrode potential (oxidation and reduction)
- Standard hydrogen electrode (SHE)
- Electrochemical series
- Relationship between EMF and Gibbs free energy
3. Nernst Equation
- Used to calculate EMF under non-standard conditions
- Formula:
E = E° – (0.0591/n) × log([products]/[reactants])
4. Conductance of Electrolytic Solutions
- Types of conductance:
- Specific conductance (κ)
- Molar conductance (Λm)
- Equivalent conductance (Λeq)
- Variation of conductance with concentration
- Kohlrausch’s law and its applications
5. Electrolysis and Faraday’s Laws
- Electrolysis of molten and aqueous electrolytes
- Faraday’s First Law:
m = Z × I × t - Faraday’s Second Law
- Electrochemical equivalent
6. Batteries and Fuel Cells
- Primary and secondary batteries
- Lead storage battery, lithium ion battery
- Hydrogen-oxygen fuel cell and its working
7. Corrosion
- Concept and mechanism of rusting
- Prevention methods
Tips to Study Electrochemistry Effectively
- Start with NCERT textbook and understand each definition and diagram
- Focus on concepts like cell reactions, standard electrode potentials, and Nernst equation
- Learn formulas and practise at least 10 numericals per formula
- Use memory tricks or short notes for Faraday’s laws and conductance terms
- Make a separate page for all units and their conversions – they matter a lot in numerical questions
- Revise real-life applications like corrosion and battery chemistry for 1-mark and case-based questions
Download PDF – NCERT Class 12 Chemistry Chapter 2: Electrochemistry
To access the full and original chapter for free, click here.
