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Electro Chemistry 3 Mark Creative Question Paper With Answer Key

12th Standard

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Chemistry

Time : 01:30:00 Hrs
Total Marks : 45

     3 Marks 

    15 x 3 = 45
  1. Answer the following question with regard to specific resistance.
    (i) How is specific resistance represented?
    (ii) What does specific resistance depend on?
    (iii) What is the reciprocal of specific resistance? How is it denoted.
    (iv) What is the unit of resitivity?

  2. Define molar conductance.

  3. Define equivalent conductance.

  4. 0.1 M solution of two electrolytes P and Q have specific conductance 4 x 10-4 S cm-1 and 6 x 10-6 S cm-1 respectively. Which among the following will have greater resistance to the flow of current? Give reason.

  5. What is the oxidation and reduction half cell in a Daniel cell?

  6. From the below graph. Explain the variation of molar conductance of a weak electrolyte with decrease in concentration.

  7. How are electro chemical cells classified? Explain.

  8. Give the oxidation and reduction half cell reaction taking place in the Daniel cell.

  9. Write the cell representation of the galvanic cell in which the following reaction take place
    \({ Zn }_{ (s) }+Cu{ SO }_{ 4 }\rightarrow { ZnSO }_{ 4 }+{ Cu }_{ (s) }\)
    For the above cell. Identify the anode and cathode half cell.

  10. Explain the IUPAC convention of representing a Galvanic cell.

  11. Explain the relationship between free energy of the cell and its emf.

  12. Leclanche cell is a non-rechargeable cell. Answer the questions below with respect to Leclanche cell.
    (i) Anode
    (ii) Cathode
    (iii) Electrolyte
    (iv) Oxidation half cell reaction
    (v) Reduction half cell reaction.

  13. Why does the emf of Leclanche cell decrease?

  14. Write the reactions taking place in anode and cathode of a mercury button cell. Give the over all redox reaction of the cell with the emf generation

  15. Explain the reactions taking place in the anode and cathode of a lead storage battery.

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