Electrochemistry Class 12 Notes Chapter 3

According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 2.

A device that generates a potential difference between electrodes by chemical reactions is called an electrochemical cell. It comprises two electron conductors, which are separated by an ionic conductor and are linked by an electron conductor. The two metallic electrodes are dipped in the electrolytic solution. The important component of this cell is an ionic conductor.

Types of Electrochemical Cell

Electrochemical cells are of two types. They are galvanic cells and electrolytic cells. These are two fundamental types of electrochemical cells.

  • Galvanic cell – In a galvanic cell, spontaneous redox reaction, the chemical energy is converted into electrical energy. It is also called a voltaic cell or Daniel cell.
  • Electrolytic cell – In an electrolytic cell, the nonspontaneous redox reaction is carried out by electrical energy.

We can obtain the standard potential of the cell by taking the difference between the standard potentials of the anode and cathode.

Also Access 
NCERT Solutions for class 12 Chemistry Chapter 3
NCERT Exemplar for class 12 Chemistry Chapter 3

Few Important Questions

  1. Define and distinguish between molar conductivity and conductivity.
  2. How much charge is required for the reduction of 1 mol of Al3+ to Al?
  3. How much electricity is necessary for the oxidation of 1 mol of H2O to O2 in coulomb?
  4. Find the cell constant of 0.001M KCl solution with the following details:

T = 208 K, conductivity = 0.146 × 10–3 S cm–1, R = 1500 Ω

  1. Calculate the molar conductivity for the following:

Conductivity = 0.0248 S cm–1, 0.20 M solution of KCl solution, Temperature = 298 K

To discover more about this chapter,  access and read up on Electrochemistry Class 12 Notes from BYJU’S.

Other Important Links:

Electrochemical Cell Standard Electrode Potential

Frequently Asked Questions on CBSE Class 12 Chemistry Notes Chapter 3 Electrochemistry


What is a galvanic cell?

A galvanic cell is an electrochemical cell in which an electric current is generated from spontaneous oxidation-reduction reactions.


What is ‘EMF’?

Electromotive force is equal to the terminal potential difference when no current flows.


What is reduction potential?

Reduction potential is the tendency of a chemical species to be reduced by gaining an electron.


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