CBSE Class 12 Chemistry Electrochemistry Notes Set F

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. (E^qZn²⁺/Zn = – 01.76V, E^qCu²⁺/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 : (E^θFe²⁺/Fe=– 0.44V;E^θZn²⁺/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.

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