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Wednesday, 14 October 2015

ELECTRO CHEMISTRY TEST paper

             ELECTRO CHEMISTRY (TEST)
 ELECTRO CHEMISTRY TEST paper


VSA TYPE QUESTIONS (1 MARK)
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 or we can conclude that there is no chemical reaction.

5. How is electrode potential different from cell potential?
 ELECTRO CHEMISTRY TEST paper

6. Can you store zinc sulphate solution in a copper container? Give suitable reason.


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

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

9. As per electrochemical series and on the basis of E° values, identify the
following :
(a) Gas which has highest tendency for reduction.
(b) Weakest oxidising ion.

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 Eo cell and equilibrium constant (K) of cell reaction.

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

14 How does specific conductance conductivity of electrolic 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.

19. Write 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

22. Rusting of iron becomes quicker in saline water. Explain.

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 oxidize 1 mole of H2O to O2.
[Ans. : 2F]SI

 QUESTIONS (2 MARKS)

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

2. List two points of difference between electro chemical cell and electrolytic cell.

3. List four 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 °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?

9. Copper does not dissolve in HCl (aq) but dissolves in HNO3 (aq) producing
Cu2+ ions. Explain the difference in behaviour.

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.

12. Explain the meaning of the terms
(a) Ionic mobility. (b) Over voltage

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