CBSE Revision Notes for Class 12 Chemistry Chapter 3 Electrochemistry PDF

CBSE Revision Notes for Class 12 Chemistry Chapter 3 Electrochemistry PDF – Electrochemistry plays an important role in CBSE Class 12. Students who are thorough with NCERT Solutions for Class 12 Chemistry Chapter 3 Electrochemistry can easily score good marks in their board exams. On this page, we have provided NCERT Solutions for Class 12 Chemistry Chapter 3 – Electrochemistry.

All the questions provided in this page are solved by our top experts of ExamHub. Each and every question comes with detailed step by step solution along with diagrammatic explanations. So candidates can download the Electrochemistry NCERT Solutions to study in offline mode as well. Read on to find out everything about CBSE NCERT Solutions for Class 12 Chemistry Chapter 3 Electrochemistry.

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NCERT Solutions for Class 12 Chemistry Chapter 3 Electrochemistry – Chapter Summary

Electrochemistry is the study of electricity production from chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations. The theoretical and theoretical and practical considerations of this chapter are extremely important. You will also know the types of electrochemical cells.

A galvanic cell will release the chemical energy when a spontaneous redox reaction is converted into electrical work, whereas in an electrolytic cell, electrical energy is used to carry out a non-spontaneous redox reaction. Some of the important concepts such as Gibbs energy and equilibrium constant will be introduced to the students in this chapter.

Electrochemistry Important Questions

Short Answer Type Questions

1. Can absolute electrode potential of an electrode be measured?
2. Under what condition is ECell = 0 or Δr G = 0?
3. Aqueous copper sulphate solution and aqueous silver nitrate solution are electrolysed by 1 ampere current for 10 minutes in separate electrolytic cells. Will the mass of copper and silver deposited on the cathode be same or different? Explain your answer.
4. Depict the galvanic cell in which the cell reaction is Cu + 2Ag+ → 2Ag + Cu2+
5. Value of standard electrode potential for the oxidation of Cl– ions is more positive than that of water, even then in the electrolysis of aqueous sodium chloride, why is Cl– oxidised at anode instead of water?
6. What is electrode potential?
7. Consider the following diagram in which an electrochemical cell is coupled to an electrolytic cell. What will be the polarity of electrodes ‘A’ and ‘B’ in the electrolytic cell?
8. Why is alternating current used for measuring resistance of an electrolytic solution?
9. A galvanic cell has electrical potential of 1.1V. If an opposing potential of 1.1V is applied to this cell, what will happen to the cell reaction and current flowing through the cell?
10. How will the pH of brine (aq. NaCl solution) be affected when it is electrolysed?
11. Unlike dry cell, the mercury cell has a constant cell potential throughout its useful life. Why?
12. Solutions of two electrolytes ‘A’ and ‘B’ are diluted. The Λm of ‘B’ increases 1.5 times while that of A increases 25 times. Which of the two is a strong electrolyte? Justify your answer.
13. When acidulated water (dil.H2SO2 solution) is electrolysed, will the pH of the solution be affected? Justify your answer.
14. In an aqueous solution how does specific conductivity of electrolytes change with addition of water?
15. Which reference electrode is used to measure the electrode potential of other electrodes?
16. Consider a cell given below Cu|Cu2+|| Cl2+|Cl2,Pt
    Write the reactions that occur at anode and cathode
17. Write the Nernst equation for the cell reaction in the Daniel cell. How will the ECell be affected when concentration of Zn2+ ions is increased?
18. What advantages do the fuel cells have over primary and secondary batteries?
19. Write the cell reaction of a lead storage battery when it is discharged. How does the density of the electrolyte change when the battery is discharged?
20. Why on dilution the Λm of CH3COOH increases drastically, while that of CH3COONa increases gradually?

Long Answer Questions

• Answer the following questions.
• (i) Cell ‘A’ has ECell = 2V and Cell ‘B’ has ECell = 1.1V which of the two cells ‘A’ or ‘B’ will act as an electrolytic cell. Which electrode reactions will occur in this cell?
• (ii) If cell ‘A’ has ECell = 0.5V and cell ‘B’ has ECell = 1.1V then what will be the reactions at anode and cathode?
• (ii) Is silver plate the anode or cathode?
• (iii) What will happen if salt bridge is removed?
• (iv) When will the cell stop functioning?
• (v) How will concentration of Zn2+ ions and Ag+ ions be affected when the cell functions?
• (vi) How will the concentration of Zn2+ ions and Ag+ ions be affected after the cell becomes ‘dead’?

What is the relationship between Gibbs free energy of the cell reaction in a galvanic cell and the emf of the cell? When will the maximum work be obtained from a galvanic cell?

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