NCERT Solutions Class 12 Chemistry Chapter 3 PDF
When we talk about electrochemistry, it is one of the significant topics to consider in the realm of chemistry. In chapter 3, students will examine the topic in detail and understand its relevance. As such, the chapter discusses some of the important elementary aspects of electrochemistry and students have to learn some formulas, diagrams and write reactions. The chapter is quite vast but since this is an important one, students have to be thorough with the topics given. Thus to help students master all the concepts and study effectively, we are providing free NCERT solutions for class 12 chemistry chapter 3 – electrochemistry here. The solutions are available in the form of a PDF and students can download it easily. Moreover, these solutions include answers to all the questions given in the class 12 chemistry textbook along with other exercises that will help students to get familiar with the chapter. Using these solutions will enable students to get an idea about the most important topics or questions and prepare well for the exams.
What Is Electrochemistry?
The branch of chemistry which deals with the conversion of chemical energy into electrical energy and vice versa is called electrochemistry.
Cells involved in electrochemistry:
Electrochemical cell: The cell in which the interconversion of electrical and chemical energy are carried out is called electrochemical cell. An electrochemical cell consists of electrodes namely cathode and anode. The non-spontaneous reaction is controlled by an external source of current. The decomposition of an electrolytic solution by passing current, which results in the liberation of corresponding gases or metals is known as electrolysis.
An electrochemical cell is of two types:
In this cell, the redox reaction takes place spontaneously and the chemical energy is converted into electrical energy. The oxidation and reduction take place in two different sections. Each section consists of an electrolytic solution and a metallic conductor which acts as an electrode.
Example: Daniel cell
In this cell Zinc and copper are used as electrodes. The redox reaction takes place between these electrodes.
At the anode the oxidation takes place and at cathode reduction takes place.
The reaction undergoing in this cell are:
At anode (oxidation) Zn(s) Zn 2+ + 2e-
At cathode (Reduction) Cu 2+ + 2e- Cu(s)
Total reaction: Zn(s) + Cu 2+ Zn 2+ + Cu(s)
In this cell electrical energy is converted into chemical energy. Electrolytic solutions contain anions and cations. The electrodes are dipped in this solution. On passing electricity, the ions in this solution move towards the opposite electrode and redox reactions take place.
Example: Electrolysis of molten sodium chloride:
Sodium chloride is heated to a temperature, electrodes are dipped and the reaction takes place in the following manner:
Sodium-ion moves towards the cathode, receives an electron and becomes sodium metal and for chlorine it is vice versa.
Na+ + e-–→ Na
Cl–→1/2 Cl2 + e–
2NaCl→ 2Na(s) + Cl2(g)
The potential difference between the two electrodes of a galvanic cell when two electrodes when no current is drawn through the cell.
Electrochemical series: The series of metal in their increasing reducing power is called electrochemical series.
Applications of electrochemical cells:
These cells are used in torches, digital cameras, hearing aids, batteries, watch, and video games. These cells are also being used in medical implants in the body. These cells are also used in satellites, rocket launch equipment. These are generally used in tiny devices for battery storage.
Get access to class 12 chemistry chapter 3 NCERT solutions PDF below.