CBSE Class 12 Chemistry Electrochemistry Notes Set 06

Revision Notes for Class 12 Chemistry: Unit 2 Electrochemistry

Review targeted revision notes for Class 12 Chemistry with the CBSE Class 12 Chemistry Electrochemistry Notes Set 06. Built according to official educational guidelines for the 2026-27 academic year, these downloadable summaries for Unit 2 Electrochemistry support daily study and last-minute exam readiness.

Review Unit 2 Electrochemistry for Class 12 Chemistry

Access the complete concept summary PDF for Unit 2 Electrochemistry below. Regular review of these targeted notes builds familiarity with complex Class 12 Chemistry themes and helps secure higher marks in final school evaluations.

ELECTROCHEMISTRY

VSA QUESTIONS (1 - MARK QUESTIONS)

1. What is a galvanic cell?

2. Give the cell representation for Daniell Cell.

3. Mention the purpose of salt-bridge placed between two half-cells of a galvanic cell?

4. Give the condition for Daniell Cell in which there is no flow of electrons or current.

5. How is electrode potential different from cell potential?

6. Can you store zinc sulphate solution in a copper container? Give suitable reason. (EqZn2+/Zn = – 01.76V, EqCu2+/Cu = 0.34v)

7. How does electrochemical series help us in predicting whether a redox reaction is feasible or not?

8. Write Nernst equation for the electrode reaction. Mn+(aq) + ne– ® M(s) at 298 K and 1 bar pressure.

10. List the two factors that influence the value of cell potential of a galvanic cell

11. How is equilibrium constant of a reaction related to standard cell potential?

12. Write the relation between Eqcell and equilibrium constant (K) of cell reaction.

13. Define cell constant. Write the SI unit of cell constant.

14 How does specific conductance or conductivity of electrolytic solution vary with temperature?

15. What is the SI unit of (i) Conductance; (ii) Conductivity.

16. Represent a concentration cell with a suitable example. 

17. State one difference between a primary battery and secondary battery.

*18. Galvanized iron does not corrode even if the coating of zinc is broken. Explain why?

(Given : (EθFe2+/Fe=– 0.44V;EθZn2+/Zn=– 0.76V)

19. Write the unit of Faraday constant.

*20. Write the name of a chemical substance which is used to prevent corrosion.

[Ans. : Bisphenol]

21. Show is the direction of flow of electrons in the following cell :

Zn (s) | Zn2+ (aq) || Ag+ (aq) | Ag (s)

22. Rusting of iron becomes quicker in saline water?

*23. Two metals A and B have reduction potential values of – 0.25V and 0.80V respectively. Which of these will liberate hydrogen gas from dilute H2SO4?

24. Express the relation between conductivity and molar conductivity.

25. Name the cell which was used in Apollo space programme.

26. How many faradays are required to oxidise 1 mole of H2O to O2.

[Ans. : 2F]

 

SA (I) TYPE QUESTIONS (2 - MARK QUESTIONS)

1. List two points of difference between metallic conductance and electrolytic conductance.

2. List two points of difference between electrochemical cell and electrolytic cell.

3. List two factors which affect the conductivity of ionic solutions.

4. A conventional method of representing a Daniel cell is :

Zn (s) | Zn2+ (1M) || Cu2+ (1M) | Cu (s).

(i) Draw a diagram of the cell and mark anode and cathode as current is drawn from the cell.

(ii) Write the reactions taking place at the cathode and the anode during the operation of Daniel cell.

*5. Suggest a method to determine the L°m value of water.

6. Write the cell reaction which occur in the lead storage battery (a) when the battery is in use (b) when the battery is on charging.
 
7. Why absolute value of electrode potential cannot be determined?
 
8. Account for the fact that when chlorine is passed through a fluoride solution,no reaction takes place. ( – )
CBSE Class 12 Chemistry notes and questions for ElectroChemistry Part C 1
 
9. Copper does not dissolve in HCl (aq) but dissolves in HNO3 (aq) producing Cu2+ ions. Explain the difference in behaviour.
CBSE Class 12 Chemistry notes and questions for ElectroChemistry Part C 2
 
10. Explain the following observations :
(a) The product of electrolysis of molten NaCl are sodium metal and chlorine gas.
(b) The product of electrolysis of aqueous sodium chloride solution are NaOH, Cl2 and H2.
 
11. What are fuel cells? Describe the principle and overall reaction involved in the working of hydrogen–oxygen fuel cell or CH3OH – O2 fuel cell.
 
12. Explain the meaning of the terms
(a) Ionic mobility. (b) Overvoltage.
 
13. Some standard reduction potential are as given below :

 CBSE Class 12 Chemistry notes and questions for ElectroChemistry Part C 3

(a) Arrange oxidising agents in order of increasing strength.
(b) Which of these oxidising agents will oxidise Cu to Cu+ under standard conditions? 
 
14. Account for the following observations : 
(a) In a dry cell, the build up of ammonia around the carbon cathode should disrupt the electric current, but in practice this does not happen. 
(b) Ordinary dry cells are not rechargeable. 
 
15. The following figure shows two electrolytic cells connected in series.
CBSE Class 12 Chemistry notes and questions for ElectroChemistry Part C 4
 

 

(a) How much electricity is required for the reduction of 1 mole of Ag+ ions to Ag? 
(b) If three faradays of electricity is passed through these cells, what is  the ratio of cations Ag+ and Cu2+ deposited on cathodes? 
 
[Ans. : (a) 1F, (b) 2:1] 
 
16. You are aquainted with the construction and working of a lead storage battery. Give the plausible reasons for these facts. 
(a) There is only a single compartment unlike other electrochemical cells which have two compartments 
(b) Addition of water is necessary from time to time for maintenance
 

Please click the link below to download pdf file for CBSE Class 12 Chemistry notes and questions for ElectroChemistry Part C.

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Unit 2 Electrochemistry Concepts and Summary for Class 12 Chemistry

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